Adjust ProtoBufPatch to protobuf-3.11.x (#35008)
Summary:
`GetEmptyStringAlreadyInited` invocation pattern in protobuf generated header files chanegd to
`:PROTOBUF_NAMESPACE_ID::internal::GetEmptyStringAlreadyInited`, where `PROTOBUF_NAMESPACE_ID` is defined in `protobuf/port_def.inc` as `google::protobuf`
This likely to have changed around protobuf-3.8.x time, but I've only tested it using protobuf-3.11.4
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35008
Test Plan: Update `third-party/protobuf` submodule to 3.11.4, compile and run `pattern_net_transform_test`
Differential Revision: D20526949
Pulled By: malfet
fbshipit-source-id: fddaa3622c48ad883612c73c40a20d306d88d66b
