fix include path

package/gcc/Makefile

@@ -21,7 +21,7 @@ include ${TOPDIR}/mk/package.mk
 $(eval $(call PKG_template,GCC,gcc,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
 $(eval $(call PKG_template,GXX,g++,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
 
-CPPFLAGS_FOR_BUILD:=	-I$(STAGING_HOST_DIR)/include
+CPPFLAGS_FOR_BUILD:=	-I$(STAGING_HOST_DIR)/usr/include
 CFLAGS_FOR_BUILD:=
 LDFLAGS_FOR_BUILD:=
 TARGET_CPPFLAGS:=