message: Try to fix broken Linux and Android CI
diff: @@ -35,6 +35,7 @@ if [[ "$KOKORO_BUILD_ID" ]]; then
  # This may or may not be needed...
  # sudo apt-key adv --keyserver apt.llvm.org --recv-keys 15CF4D18AF4F7421
  sudo apt-add-repository "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-$CLANG_VERSION main"
  + wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
  sudo apt-get update -y
  sudo apt-get --assume-yes --force-yes install clang-$CLANG_VERSION
  