message: Fix bug in _basename. I accidentally used a backslash on Linux and forwardslash on Windows.
diff: @@ -855,7 +855,7 @@ def _basename(repository_ctx, path_str):
  is_win = is_windows(repository_ctx)
  for i in range(num_chars):
  r_i = num_chars - 1 - i
  - if (is_win and path_str[r_i] == "/") or path_str[r_i] == "\\":
  + if (is_win and path_str[r_i] == "\\") or path_str[r_i] == "/":
  return path_str[r_i + 1:]
  return path_str
  