grub2: disable stack-protector

- enabling "-fstack-protector" results in build errors
- Upstream explicitly tests & disables it

v2:
- use override

reference: upstream commit baa2a121e004a95a12e2bb7f2419de6625a30c2d

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

SVN-Revision: 46126

package/boot/grub2/Makefile

@@ -22,6 +22,8 @@ PKG_MD5SUM:=be62932eade308a364ea4bbc91295930
 HOST_BUILD_PARALLEL:=1
 PKG_BUILD_DEPENDS:=grub2/host
 
+PKG_SSP:=0
+
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/package.mk