Source tree has many empty directories?

Hi Developers,

My -head source tree might be dirty over the years, but there appears to 
be some empty directories. Can these just be removed?

--HPS

find . -type d -empty
./sys/fs/nandfs
./sys/mips/gxemul
./sys/gnu/dts/include/dt-bindings/genpd
./sys/modules/drm/r128
./sys/modules/drm/sis
./sys/modules/drm/via
./sys/modules/drm/drm
./sys/modules/drm/mach64
./sys/modules/drm/mga
./sys/modules/drm/tdfx
./sys/modules/drm/savage
./sys/modules/if_tun
./sys/modules/nandfs
./sys/modules/nand
./sys/modules/nandsim
./sys/modules/drm2/drm2
./sys/modules/drm2/radeonkmsfw/ARUBA_me
./sys/modules/drm2/radeonkmsfw/VERDE_ce
./sys/modules/drm2/radeonkmsfw/TURKS_pfp
./sys/modules/drm2/radeonkmsfw/HAINAN_mc
./sys/modules/drm2/radeonkmsfw/CAYMAN_pfp
./sys/modules/drm2/radeonkmsfw/HAINAN_me
./sys/modules/drm2/radeonkmsfw/BARTS_pfp
./sys/modules/drm2/radeonkmsfw/CAICOS_mc
./sys/modules/drm2/radeonkmsfw/CAICOS_me
./sys/modules/drm2/radeonkmsfw/CEDAR_pfp
./sys/modules/drm2/radeonkmsfw/RV710_pfp
./sys/modules/drm2/radeonkmsfw/RV630_pfp
./sys/modules/drm2/radeonkmsfw/R600_rlc
./sys/modules/drm2/radeonkmsfw/TAHITI_ce
./sys/modules/drm2/radeonkmsfw/RV670_pfp
./sys/modules/drm2/radeonkmsfw/BARTS_mc
./sys/modules/drm2/radeonkmsfw/ARUBA_rlc
./sys/modules/drm2/radeonkmsfw/RV635_pfp
./sys/modules/drm2/radeonkmsfw/BARTS_me
./sys/modules/drm2/radeonkmsfw/CYPRESS_pfp
./sys/modules/drm2/radeonkmsfw/PALM_pfp
./sys/modules/drm2/radeonkmsfw/HAINAN_rlc
./sys/modules/drm2/radeonkmsfw/RV710_me
./sys/modules/drm2/radeonkmsfw/OLAND_pfp
./sys/modules/drm2/radeonkmsfw/RV730_me
./sys/modules/drm2/radeonkmsfw/OLAND_ce
./sys/modules/drm2/radeonkmsfw/R200_cp
./sys/modules/drm2/radeonkmsfw/RV770_me
./sys/modules/drm2/radeonkmsfw/REDWOOD_pfp
./sys/modules/drm2/radeonkmsfw/SUMO2_pfp
./sys/modules/drm2/radeonkmsfw/JUNIPER_rlc
./sys/modules/drm2/radeonkmsfw/PITCAIRN_pfp
./sys/modules/drm2/radeonkmsfw/PITCAIRN_ce
./sys/modules/drm2/radeonkmsfw/SUMO_rlc
./sys/modules/drm2/radeonkmsfw/REDWOOD_me
./sys/modules/drm2/radeonkmsfw/TAHITI_pfp
./sys/modules/drm2/radeonkmsfw/CEDAR_me
./sys/modules/drm2/radeonkmsfw/SUMO_uvd
./sys/modules/drm2/radeonkmsfw/VERDE_rlc
./sys/modules/drm2/radeonkmsfw/HAINAN_ce
./sys/modules/drm2/radeonkmsfw/CAICOS_pfp
./sys/modules/drm2/radeonkmsfw/R300_cp
./sys/modules/drm2/radeonkmsfw/BTC_rlc
./sys/modules/drm2/radeonkmsfw/CAYMAN_rlc
./sys/modules/drm2/radeonkmsfw/CEDAR_rlc
./sys/modules/drm2/radeonkmsfw/RV610_pfp
./sys/modules/drm2/radeonkmsfw/VERDE_mc
./sys/modules/drm2/radeonkmsfw/VERDE_me
./sys/modules/drm2/radeonkmsfw/RV730_pfp
./sys/modules/drm2/radeonkmsfw/CYPRESS_rlc
./sys/modules/drm2/radeonkmsfw/R700_rlc
./sys/modules/drm2/radeonkmsfw/RS780_pfp
./sys/modules/drm2/radeonkmsfw/RV770_pfp
./sys/modules/drm2/radeonkmsfw/R600_pfp
./sys/modules/drm2/radeonkmsfw/RV710_uvd
./sys/modules/drm2/radeonkmsfw/JUNIPER_me
./sys/modules/drm2/radeonkmsfw/OLAND_rlc
./sys/modules/drm2/radeonkmsfw/ARUBA_pfp
./sys/modules/drm2/radeonkmsfw/TAHITI_mc
./sys/modules/drm2/radeonkmsfw/TAHITI_me
./sys/modules/drm2/radeonkmsfw/HAINAN_pfp
./sys/modules/drm2/radeonkmsfw/REDWOOD_rlc
./sys/modules/drm2/radeonkmsfw/RS780_me
./sys/modules/drm2/radeonkmsfw/CYPRESS_uvd
./sys/modules/drm2/radeonkmsfw/RV635_me
./sys/modules/drm2/radeonkmsfw/R600_me
./sys/modules/drm2/radeonkmsfw/R420_cp
./sys/modules/drm2/radeonkmsfw/PITCAIRN_rlc
./sys/modules/drm2/radeonkmsfw/PALM_me
./sys/modules/drm2/radeonkmsfw/OLAND_mc
./sys/modules/drm2/radeonkmsfw/OLAND_me
./sys/modules/drm2/radeonkmsfw/JUNIPER_pfp
./sys/modules/drm2/radeonkmsfw/TAHITI_rlc
./sys/modules/drm2/radeonkmsfw/RV620_pfp
./sys/modules/drm2/radeonkmsfw/SUMO2_me
./sys/modules/drm2/radeonkmsfw/CAYMAN_mc
./sys/modules/drm2/radeonkmsfw/TURKS_mc
./sys/modules/drm2/radeonkmsfw/PITCAIRN_mc
./sys/modules/drm2/radeonkmsfw/SUMO_pfp
./sys/modules/drm2/radeonkmsfw/CAYMAN_me
./sys/modules/drm2/radeonkmsfw/TURKS_me
./sys/modules/drm2/radeonkmsfw/PITCAIRN_me
./sys/modules/drm2/radeonkmsfw/RS600_cp
./sys/modules/drm2/radeonkmsfw/RV610_me
./sys/modules/drm2/radeonkmsfw/RV620_me
./sys/modules/drm2/radeonkmsfw/TAHITI_uvd
./sys/modules/drm2/radeonkmsfw/RV630_me
./sys/modules/drm2/radeonkmsfw/R100_cp
./sys/modules/drm2/radeonkmsfw/SUMO_me
./sys/modules/drm2/radeonkmsfw/RS690_cp
./sys/modules/drm2/radeonkmsfw/RV670_me
./sys/modules/drm2/radeonkmsfw/CYPRESS_me
./sys/modules/drm2/radeonkmsfw/R520_cp
./sys/modules/drm2/radeonkmsfw/VERDE_pfp
./sys/modules/drm2/i915kms
./sys/modules/drm2/radeonkms
./sys/modules/if_tap
./sys/dev/nand
./crypto/heimdal/lib/sqlite
./usr.bin/send-pr
./sbin/nandfs
./sbin/newfs_nandfs
./tools/tools/nanobsd/gateworks/Files/root
./tools/tools/nanobsd/gateworks/cfg/ssh
./tools/tools/nanobsd/rescue/Pkg
./contrib/traceroute/lbl
./contrib/ipfilter/net
./contrib/ipfilter/ipsd/Celler
./contrib/netbsd-tests/dev/usb/libhid
./contrib/netbsd-tests/dev/usb/t_hid
./contrib/netbsd-tests/crypto/libcrypto/x509v3
./contrib/netbsd-tests/crypto/libcrypto/rsa
./contrib/netbsd-tests/crypto/libcrypto/rc2
./contrib/netbsd-tests/crypto/libcrypto/bf
./contrib/netbsd-tests/crypto/libcrypto/rc4
./contrib/netbsd-tests/crypto/libcrypto/rc5
./contrib/netbsd-tests/crypto/libcrypto/dh
./contrib/netbsd-tests/crypto/libcrypto/lhash
./contrib/netbsd-tests/crypto/libcrypto/bn/exp
./contrib/netbsd-tests/crypto/libcrypto/bn/bn
./contrib/netbsd-tests/crypto/libcrypto/bn/div
./contrib/netbsd-tests/crypto/libcrypto/idea
./contrib/netbsd-tests/crypto/libcrypto/sha
./contrib/netbsd-tests/crypto/libcrypto/ecdsa
./contrib/netbsd-tests/crypto/libcrypto/ripemd
./contrib/netbsd-tests/crypto/libcrypto/md2
./contrib/netbsd-tests/crypto/libcrypto/md4
./contrib/netbsd-tests/crypto/libcrypto/rand
./contrib/netbsd-tests/crypto/libcrypto/md5
./contrib/netbsd-tests/crypto/libcrypto/mdc2
./contrib/netbsd-tests/crypto/libcrypto/ec
./contrib/netbsd-tests/crypto/libcrypto/cast
./contrib/netbsd-tests/crypto/libcrypto/evp
./contrib/netbsd-tests/crypto/libcrypto/threads
./contrib/netbsd-tests/crypto/libcrypto/sha1
./contrib/netbsd-tests/crypto/libcrypto/ecdh
./contrib/netbsd-tests/crypto/libcrypto/srp
./contrib/netbsd-tests/crypto/libcrypto/engine
./contrib/netbsd-tests/crypto/libcrypto/dsa
./contrib/netbsd-tests/crypto/libcrypto/des
./contrib/netbsd-tests/crypto/libcrypto/hmac
./contrib/netbsd-tests/lib/libtre
./contrib/netbsd-tests/lib/libposix/posix2
./contrib/netbsd-tests/lib/libposix/bsd
./contrib/netbsd-tests/lib/libposix/posix1
./contrib/apr/include/private
./contrib/wpa/patches
./contrib/wpa/src/hlr_auc_gw
./contrib/wpa/wpa_supplicant/tests
./contrib/compiler-rt/lib/builtins/armv6m
./contrib/compiler-rt/lib/sancov
./contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Go
./contrib/llvm/tools/lldb/source/Plugins/LanguageRuntime/Go
./contrib/llvm/tools/lldb/source/Plugins/LanguageRuntime/Java
./contrib/llvm/tools/lldb/source/Plugins/ExpressionParser/Go
./contrib/llvm/tools/lldb/source/Plugins/Language/Go
./contrib/llvm/tools/lldb/source/Plugins/Language/Java
./contrib/llvm/tools/lldb/source/Plugins/Language/OCaml
./contrib/llvm/tools/llvm-mca/include/HardwareUnits
./contrib/llvm/tools/llvm-mca/include/Stages
./contrib/llvm/tools/llvm-mca/lib/HardwareUnits
./contrib/llvm/tools/llvm-mca/lib/Stages
./contrib/llvm/include/llvm/MC/MCAnalysis
./contrib/llvm/include/llvm/BinaryFormat/WasmRelocs
./contrib/llvm/include/llvm/TextAPI/MachO
./contrib/llvm/lib/ExecutionEngine/JIT
./contrib/llvm/lib/MC/MCAnalysis
./contrib/llvm/lib/Target/Nios2/MCTargetDesc
./contrib/llvm/lib/Target/Nios2/TargetInfo
./contrib/llvm/lib/Target/Nios2/InstPrinter
./contrib/llvm/lib/TextAPI/MachO
./contrib/libxo/m4
./usr.sbin/nandsim
./usr.sbin/nandtool
./usr.sbin/bsdconfig/fdisk
./lib/libnandfs
./cddl/contrib/opensolaris/common/avl
./stand/sparc64/zfsloader