base-files: default_postinst() force clear luci-indexcache

Inside every LuCI package you need to clear luci-indexcache and
sometimes when installing non LuCI pacakges it's also needed to clear
it. Easier put it into default_postinst().

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

SVN-Revision: 42923

package/base-files/files/lib/functions.sh

@@ -216,6 +216,7 @@ default_postinst() {
 			$i start
 		}
 	done
+	[ -n "${IPKG_INSTROOT}" ] || rm -f /tmp/luci-indexcache 2>/dev/null
 	return 0
 }