Enable CMake builds within AOSP with build_cmake.rs am: dcb294c695

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-sys/+/3063146

Change-Id: I5af93ca37a0153362031e017234987716bb32846
Signed-off-by: Automerger Merge Worker <[email protected]>