sh: fix zImage build with >=binutils-2.18

Starting with binutils somewhere around 2.17.50.14 the vmlinux file
contains a ".note.gnu.build-id" section which doesn't get removed when
the zImage is built; resulting in a 2GB intermediate file and a broken
zImage.
Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Makefile

@@ -66,7 +66,7 @@ cflags-y	+= $(isaflags-y) -ffreestanding
 cflags-$(CONFIG_MORE_COMPILE_OPTIONS)	+= \
 	$(shell echo $(CONFIG_COMPILE_OPTIONS) | sed -e 's/"//g')
 
-OBJCOPYFLAGS	:= -O binary -R .note -R .comment -R .stab -R .stabstr -S
+OBJCOPYFLAGS	:= -O binary -R .note -R .note.gnu.build-id -R .comment -R .stab -R .stabstr -S
 
 #
 # arch/sh/defconfig doesn't reflect any real hardware, and as such should