Merge "Drop CLANG and CLANG_CXX in the environment" am: 27a55cd3c7
am: f03398b651

* commit 'f03398b6519e1d9695c61da450346d5a0f0f8528':
  Drop CLANG and CLANG_CXX in the environment

Change-Id: I9fce3d3c203b89295529c72de4d094ff62d178fd