message: Update .gitignore
  Gclient now creates a .cipd directory so we ignore it. third_party/stb
  was removed so we stop ignoring it.
diff: *.pyc
  # Directories added by gclient sync and the GN build
  +.cipd
  .gclient
  .gclient_entries
  build
  @@ -19,7 +20,6 @@ third_party/markupsafe/
  third_party/shaderc/
  third_party/spirv-cross/
  third_party/spirv-headers/
  -third_party/stb/
  tools
  out
  