installworld is broken when world is built without compiler

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 I'm updating my NanoBSD installation, which doesn't include any
toolchain in buildworld/installworld, to r283052.

 And here are problem: sys/boot/efi/loader tries to build something at
"installworld":

===> sys/boot/efi/loader (install)
cc -O2 -pipe   -fPIC -I/data/src/sys/boot/efi/loader
- -I/data/src/sys/boot/efi/loader/arch/amd64
- -I/data/src/sys/boot/efi/loader/../include
- -I/data/src/sys/boot/efi/loader/../include/amd64
- -I/data/src/sys/boot/efi/loader/../../../contrib/dev/acpica/include
- -I/data/src/sys/boot/efi/loader/../../..
- -I/data/src/sys/boot/efi/loader/../../i386/libi386 -DNO_PCI -DEFI
- -DBOOT_FORTH -I/data/src/sys/boot/efi/loader/../../ficl
- -I/data/src/sys/boot/efi/loader/../../ficl/amd64 -DLOADER_DISK_SUPPORT
- -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT
- -I/data/src/sys/boot/efi/loader/../../common -ffreestanding -Wformat
- -msoft-float -fshort-wchar -mno-red-zone -mno-mmx -mno-sse -mno-aes
- -mno-avx -std=gnu99   -Qunused-arguments -c
/data/src/sys/boot/efi/loader/autoload.c -o autoload.o
/tmp/install.oRhcsq97/sh: cc: not found
*** Error code 127

Stop.
make[7]: stopped in /data/src/sys/boot/efi/loader

 And this file is here, in object directory:

% find /data/obj.nano/gateway.v2/data/src -name autoload.o
/data/obj.nano/gateway.v2/data/src/sys/boot/efi/loader/autoload.o
% ls /data/obj.nano/gateway.v2/data/src/sys/boot/efi/loader
amd64_tramp.o           conf.o                  elf64_freebsd.o
load_elf32_obj.o        main.o                  reloc_elf64.o
autoload.o              console.o               framebuffer.o
load_elf64.o            misc.o                  self_reloc.o
bcache.o                copy.o                  interp.o
load_elf64_obj.o        module.o                smbios.o
boot.o                  crc32.o                 interp_backslash.o
loader.efi              nullconsole.o           start.o
bootinfo.o              devicename.o            interp_forth.o
loader.sym              panic.o                 vers.c
comconsole.o            devopen.o               interp_parse.o
ls.o                    part.o                  vers.o
commands.o              disk.o                  load_elf32.o
machine                 reloc_elf32.o           x86
%

- -- 
// Lev Serebryakov
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