Don't remove .protobuf_version on clean as it forces recompiles
Don't remove .protobuf_version on clean as it forces recompiles

Building protoc takes a while and deleting our .protobuf_version
during `make clean` is causing a full reconfigure and rebuild of
protoc, even though nothing changed there.

Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

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ributions,WANdisco/gerrit,gcoders/gerrit,supriyantomaftuh/gerrit,catrope/gerrit,Saulis/gerrit,bpollack/gerrit,sudosurootdev/gerrit,TonyChai24/test,joshuawilson/merrit,GerritCodeReview/gerrit,netroby/gerrit,Saulis/gerrit,Team-OctOS/host_gerrit,joshuawilson/merrit,jeblair/gerrit,anminhsu/gerrit