ppc: remove tmpfile for ppc binutils check

make distclean does not remove the new tmp file .tmp_gas_check.
Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

arch/ppc/Makefile

@@ -131,4 +131,6 @@ endif
 	@true
 
 CLEAN_FILES +=	include/asm-$(ARCH)/offsets.h \
-		arch/$(ARCH)/kernel/asm-offsets.s
+		arch/$(ARCH)/kernel/asm-offsets.s \
+		$(TOUT)
+