Merge pull request #2692 from cgrushko/patch-3

Update load() statement to latest style

BUILD

@@ -31,7 +31,7 @@ LINK_OPTS = select({
 })
 
 load(
-    "protobuf",
+    ":protobuf.bzl",
     "cc_proto_library",
     "py_proto_library",
     "internal_copied_filegroup",