message: repo.bzl: Run `patch -p1` in _apply_patch on Windows
  The patch command in MSYS is version 2.7, which also supports renaming.
diff: @@ -61,12 +61,13 @@ def _repos_are_siblings():
  return Label("@foo//bar").workspace_root.startswith("../")
  # Apply a patch_file to the repository root directory
  -# Runs 'git apply'
  +# Runs 'git apply' on Unix, 'patch -p1' on Windows.
  def _apply_patch(ctx, patch_file):
  - cmd = _wrap_bash_cmd(
  - ctx,
  - ["git", "apply", "-v", ctx.path(patch_file)],
  - )
  + if _is_windows(ctx):
  + patch_command = ["patch", "-p1", "-d", ctx.path("."), "-i", ctx.path(patch_file)]
  + else:
  + patch_command = ["git", "apply", "-v", ctx.path(patch_file)]
  + cmd = _wrap_bash_cmd(ctx, patch_command)
  _execute_and_check_ret_code(ctx, cmd)
  def _apply_delete(ctx, paths):
  