Merge "rust: Emit -x c++ for bindgen modules with cpp_std" into main am:...

Merge "rust: Emit -x c++ for bindgen modules with cpp_std" into main am: e94f26e2 am: 73edb1b4 am: 7cae239d

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2779108



Change-Id: If258da6299a675bb4538719bcf187fffee2fc204
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>