message: Fix a typo in runlit.site.cfg.py
diff: @@ -22,7 +22,7 @@ import platform
  import lit.llvm
  # Handle the test srcdir for platforms. On windows, things are weird with bazel.
  -if platform.system == 'Windows':
  +if platform.system() == 'Windows':
  srcdir = os.environ['TEST_SRCDIR']
  real_test_srcdir = srcdir[:srcdir.find('tensorflow/compiler/mlir')]
  external_srcdir = os.path.join(real_test_srcdir, 'external')
  @@ -56,7 +56,7 @@ test_dir = test_dir.strip('/').rsplit(':', 1)[0]
  config.mlir_test_dir = os.path.join(real_test_srcdir,
  os.environ['TEST_WORKSPACE'], test_dir)
  -if platform.system == 'Windows':
  +if platform.system() == 'Windows':
  # Configure this to work with msys2, TF's preferred windows bash.
  config.lit_tools_dir = '/usr/bin'
  