Add -ffreestanding to the command line, so taht inflate.c compiles and link

properly with llvm.

PR:		arm/156771
Submitted by:	Damjan Marion <damjan dot marion at gmail DOT com>

sys/conf/Makefile.arm

@@ -108,7 +108,8 @@ ${KERNEL_KO}.tramp: ${KERNEL_KO} $S/$M/$M/inckern.S $S/$M/$M/elf_trampoline.c
 	gzip -9 ${KERNEL_KO}.tmp
 	eval $$(stat -s ${KERNEL_KO}.tmp.gz) && \
 	echo "#define KERNCOMPSIZE $$st_size" >>opt_kernname.h
-	${CC} -O2 -DKZIP -I. -I$S -c $S/kern/inflate.c -o inflate-tramp.o
+	${CC} -O2 -ffreestanding -DKZIP -I. -I$S -c $S/kern/inflate.c -o \
+	    inflate-tramp.o
 	${CC} -O -nostdlib -I. -I$S -Xlinker -T -Xlinker ldscript.$M.tramp \
 	-DKZIP tmphack.S $S/$M/$M/elf_trampoline.c inflate-tramp.o \
 	$S/$M/$M/inckern.S ${FILES_CPU_FUNC} -o ${KERNEL_KO}.gz.tramp