sparse: make x86 and ppc64 set the architecture-specific #define's

explcitly.

sparse doesn't set any arch defines itself.

arch/i386/Makefile

@@ -18,6 +18,7 @@
 LDFLAGS		:= -m elf_i386
 OBJCOPYFLAGS	:= -O binary -R .note -R .comment -S
 LDFLAGS_vmlinux :=
+CHECK		:= $(CHECK) -D__i386__=1
 
 CFLAGS += -pipe -msoft-float
 

arch/ppc64/Makefile

@@ -20,9 +20,10 @@ ifeq ($(HAS_BIARCH),y)
 AS              := $(AS) -64
 LD              := $(LD) -m elf64ppc
 CC		:= $(CC) -m64
-CHECK		:= $(CHECK) -m64
 endif
 
+CHECK		:= $(CHECK) -m64 -D__powerpc__=1
+
 LDFLAGS		:= -m elf64ppc
 LDFLAGS_vmlinux	:= -Bstatic -e $(KERNELLOAD) -Ttext $(KERNELLOAD)
 CFLAGS		+= -msoft-float -pipe -Wno-uninitialized -mminimal-toc \