ipc: Add git revision check for client/service

Christoph Haag requested to merge haagch/monado:check_version into master

I'm not sure adding a hard error for simply different git hashes is what we really want.

I would also be happy to default this to a warning instead. But then we should introduce manual ipc protocol versioning where the programmer manually increases a version number whenever changing the ipc protocol or the shared memory layout.

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