Remove timestamp from GOD output
This makes the stack build reproducible and therefore ccache hit efficiency improves dramatically. This should save a lot of time in the nightlies when there aren't many or deep changes being tested. It also saves time locally for the same reason.
For example, for LHCb with a hot ccache we have
- Before this change: 570/1277 hits
- After this change: 1277/1277 hits
Edited by Marco Cattaneo