message: Remove set_build_strip_flag
diff: @@ -1399,10 +1399,6 @@ def set_grpc_build_flags():
  write_to_bazelrc('build --define grpc_no_ares=true')
  -def set_build_strip_flag():
  - write_to_bazelrc('build --strip=always')
  -
  -
  def set_windows_build_flags(environ_cp):
  """Set Windows specific build options."""
  # The non-monolithic build is not supported yet
  