Add .bazelrc that pins C++ version to C++17
Add .bazelrc that pins C++ version to C++17

Change-Id: I9347ad6af4840aca18424361005906bcaf5b4be0

world-federation-of-advertisers/cross-media-measurement,world-federation-of-advertisers/cross-media-measurement,world-federation-of-advertisers/cross-media-measurement