Speed up windows more and do some simple fixes
cerbero: Don't try to git commit if nothing to commit git commit will fail if there's nothing to commit. This can happen if all the commands in the extract step completed successfully, but the step was marked as failed or was cancelled. In that case, the step will be tried again and since all commands will be idempotent, there won't be anything to commit. Check whether we need to commit before trying to commit.
cerbero: Do not warn about non-existent cache file This is unnecessary. Happens every single time you wipe.
bootstrap: Don't use autotools build-tools on Windows We should never run autoreconf because it hangs on the Windows CI runner.