message: Bump max Bazel version to 0.25.2
  Also removed a workaround
diff: @@ -1388,7 +1388,7 @@ def main():
  # environment variables.
  environ_cp = dict(os.environ)
  - current_bazel_version = check_bazel_version('0.24.1', '0.24.1')
  + current_bazel_version = check_bazel_version('0.24.1', '0.25.2')
  _TF_CURRENT_BAZEL_VERSION = convert_version_to_int(current_bazel_version)
  reset_tf_configure_bazelrc()
  @@ -1551,12 +1551,6 @@ def main():
  set_action_env_var(environ_cp, 'TF_CONFIGURE_IOS', 'iOS', False)
  if environ_cp.get('TF_CONFIGURE_IOS') == '1':
  configure_ios()
  - else:
  - # TODO(pcloudy): Remove BAZEL_USE_CPP_ONLY_TOOLCHAIN after Bazel is upgraded
  - # to 0.24.0.
  - # For working around https://github.com/bazelbuild/bazel/issues/7607
  - if is_macos():
  - write_to_bazelrc('build --action_env=BAZEL_USE_CPP_ONLY_TOOLCHAIN=1')
  print('Preconfigured Bazel build configs. You can use any of the below by '
  'adding "--config=<>" to your build command. See .bazelrc for more '
  