[PATCH] ppc64: fix cross-compilation

After the "ppc64 monster cleanup," I get

    powerpc-750-linux-gnu-strip: vmlinux: File format not recognized

from my ppc32 strip command when cross-compiling a ppc64 kernel, since
vmlinux is a 64-bit ELF file.  This patch fixes my build (and the
resulting kernel boots fine).
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/boot/Makefile

@@ -31,7 +31,6 @@ BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional
 BOOTLD		:= $(CROSS32_COMPILE)ld
 BOOTLFLAGS	:= -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
 BOOTOBJCOPY	:= $(CROSS32_COMPILE)objcopy
-BOOTSTRIP	:= $(CROSS32_COMPILE)strip
 OBJCOPYFLAGS    := contents,alloc,load,readonly,data
 
 src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
@@ -71,7 +70,7 @@ quiet_cmd_ramdisk = RAMDISK $@
       cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
 
 quiet_cmd_stripvm = STRIP $@
-      cmd_stripvm = $(BOOTSTRIP) -s $< -o $@
+      cmd_stripvm = $(STRIP) -s $< -o $@
 
 vmlinux.strip: vmlinux FORCE
 	$(call if_changed,stripvm)