[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: 11bf32bb -s ours

am skip reason: Change-Id Ia972c74d804085196a7b6ec755af63042c6b3909 with SHA-1 2dcf402e is in history

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

Change-Id: If77e558fc3fbc72c787274a50a425817a132b57a