Merge changes If92be663,I377f3409,I7bb22856,I98d484b3,I945f2c7c, ...

* changes:
  gn2bp: Remove unused builtin_deps
  gn2bp: Allow pclmul and ssse3 cflag
  gn2bp: Use list for cflag_allowlist
  gn2bp: Fix to bubble up proto static_lib deps
  gn2bp: Use chromium protoc to generate .c/.h files
  gn2bp: create modules for protoc
  gn2bp: Remove third_party protobuf from local_include_dirs_denylist
  gn2bp: Remove third_party protobuf from builtin_deps