Build debian's micro-revision into the binary
If we have a debian/micro-revision.i, replace the one in src/or with our copy so that this will be the revision that ends up in the binary. This is an informational only version string, but it'd be kinda nice if it was (more) accurate nonetheless. Of course this won't help if people manually patch around but it's still preferable to claiming we are exactly upstream's source. If we are building directly out of a git tree, update debian/micro-revision.i in the clean target.