add gcc package to bulk builds again

mk/build.mk

@@ -16,7 +16,6 @@ DEFCONFIG=		ADK_DEVELSYSTEM=n \
 			ADK_MAKE_PARALLEL=n \
 			ADK_FORCE_PARALLEL=n \
 			ADK_PACKAGE_GRUB=n \
-			ADK_PACKAGE_GCC=n \
 			ADK_PACKAGE_AUFS2_UTIL=n \
 			ADK_PACKAGE_BASE_FILES=y \
 			ADK_COMPILE_HEIMDAL=n \