[PATCH] kbuild: fix for i386 cross compile

I used to be be able to cross compile for i386 on my x86_64 machine,
but recently something (gcc/binutils?) changed, and it stopped working.

Following patch makes cross compile work with:

make ARCH=i386 CFLAGS_KERNEL="-m32" AFLAGS_KERNEL="-m32" bzImage

Without the patch I'm getting the following error:

  SYSCALL arch/i386/kernel/vsyscall-syms.o
/usr/lib/gcc/x86_64-pc-linux-gnu/3.4.3/../../../../x86_64-pc-linux-gnu/bin/ld:
Relocatable linking with relocations from format elf32-i386
(arch/i386/kernel/vsyscall-sysenter.o) to format elf64-x86-64
(arch/i386/kernel/vsyscall-syms.o) is not supported
collect2: ld returned 1 exit status
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

arch/i386/kernel/Makefile

@@ -46,7 +46,7 @@ targets += vsyscall.lds
 
 # The DSO images are built using a special linker script.
 quiet_cmd_syscall = SYSCALL $@
-      cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \
+      cmd_syscall = $(CC) -m elf_i386 -nostdlib $(SYSCFLAGS_$(@F)) \
 		          -Wl,-T,$(filter-out FORCE,$^) -o $@
 
 export CPPFLAGS_vsyscall.lds += -P -C -U$(ARCH)