[automerger skipped] Add RBE_CXX_COMPARE variable to locally disable compare...

[automerger skipped] Add RBE_CXX_COMPARE variable to locally disable compare mode for C++ am: 0118dd2f am: 7de98747 -s ours am: 0eff0c08 -s ours am: 23dd7326 -s ours am: dcf4736f -s ours

am skip reason: Change-Id Ia972c74d804085196a7b6ec755af63042c6b3909 with SHA-1 0118dd2f is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12599824

Change-Id: I1bcd7e5e95bc3e967365935feb505e4f2d3ee104