buildworld fails on recent stable

[Volodymyr Kostyrko]

Hi all.

When CLANG_IS_CC build fails at sys/boot/i386/boot2:

ld -static -N --gc-sections -nostdlib -m elf_i386_fbsd -Ttext 0x2000 -o 
boot2.out /usr/obj/usr/src/sys/boot/i386/boot2/../btx/lib/crt0.o boot2.o 
sio.o
objcopy -S -O binary boot2.out boot2.bin
btxld -v -E 0x2000 -f bin -b 
/usr/obj/usr/src/sys/boot/i386/boot2/../btx/btx/btx -l boot2.ldr  -o 
boot2.ld -P 1 boot2.bin
kernel: ver=1.02 size=690 load=9000 entry=9010 map=16M pgctl=1:1
client: fmt=bin size=1575 text=0 data=0 bss=0 entry=0
output: fmt=bin size=1e05 text=200 data=1c05 org=0 entry=0
-5 bytes available
*** [boot2] Error code 1

The relevant output before r242562 looked like:

ld -static -N --gc-sections -nostdlib -m elf_i386_fbsd -Ttext 0x2000 -o 
boot2.out /usr/obj/usr/src/sys/boot/i386/boot2/../btx/lib/crt0.o boot2.o 
sio.o
objcopy -S -O binary boot2.out boot2.bin
btxld -v -E 0x2000 -f bin -b 
/usr/obj/usr/src/sys/boot/i386/boot2/../btx/btx/btx -l boot2.ldr  -o 
boot2.ld -P 1 boot2.bin
kernel: ver=1.02 size=690 load=9000 entry=9010 map=16M pgctl=1:1
client: fmt=bin size=1569 text=0 data=0 bss=0 entry=0
output: fmt=bin size=1df9 text=200 data=1bf9 org=0 entry=0
7 bytes available
dd if=boot2.ld of=boot2 obs=7680 conv=osync

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