[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: e61a10df -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: Ic537220ecc136290ae47a680ed7296dd621282bd