r279842 could not do "installworld" if compiler was not build at "buildoworld" phase (amd64/efi trys to compile on install)

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 NaonBSD build with r279842 host and r279842 sources without compiler
built in "buildworld" stage fails to make "installworld" because it
try to compile "sys/boot/amd64/efi" at install phase:

I have this in "src.conf"

WITHOUT_CROSS_COMPILER=yes
WITHOUT_CLANG=yes
WITHOUT_BINUTILS=yes
WITHOUT_ELFTOOLCHAIN_TOOLS=yes
WITHOUT_GCC=yes
WITHOUT_TOOLCHAIN=yes

 And got this at "make installworld":

===> sys/boot/userboot/userboot (install)
install  -o root -g wheel -m 444     userboot.so
/data/obj.nano/gateway.v2/_.w/boot
===> sys/boot/ficl32 (install)
===> sys/boot/ficl (install)
===> sys/boot/amd64 (install)
===> sys/boot/amd64/efi (install)
cc -O2 -pipe   -fPIC -I.
- -I/data/src/sys/boot/amd64/efi/../../efi/include
- -I/data/src/sys/boot/amd64/efi/../../efi/include/amd64
- -I/data/src/sys/boot/amd64/efi/../../../contrib/dev/acpica/include
- -I/data/src/sys/boot/amd64/efi/../../.. -DBOOT_FORTH
- -I/data/src/sys/boot/amd64/efi/../../ficl
- -I/data/src/sys/boot/amd64/efi/../../ficl/amd64 -DLOADER_DISK_SUPPORT
- -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT
- -I/data/src/sys/boot/amd64/efi/../../common -ffreestanding -mno-mmx
- -mno-sse -mno-aes -mno-avx -msoft-float -std=gnu99
- -Qunused-arguments -c /data/src/sys/boot/amd64/efi/autoload.c
/tmp/install.4m4ZY660/sh: cc: not found
*** Error code 127

Stop.
make[7]: stopped in /data/src/sys/boot/amd64/efi
*** Error code 1

r278206 worked with this config.

BTW, it will be nice to have WITHOUT_UEFI knob.

- -- 
// Lev Serebryakov
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