[PATCH] CHECKFLAGS on ppc64 got broken

Now that asm-powerpc/* is using ifdefs on __powerpc64__ we need to add it
to CHECKFLAGS on ppc64.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/ppc64/Makefile

@@ -49,7 +49,7 @@ NM		:= $(NM) --synthetic
 
 endif
 
-CHECKFLAGS	+= -m64 -D__powerpc__
+CHECKFLAGS	+= -m64 -D__powerpc__ -D__powerpc64__
 
 LDFLAGS		:= -m elf64ppc
 LDFLAGS_vmlinux	:= -Bstatic -e $(KERNELLOAD) -Ttext $(KERNELLOAD)