Fix GCS feature when s3 (default) is disabled
Fix GCS feature when s3 (default) is disabled

luser/sccache2,glandium/sccache,luser/sccache2,glandium/sccache,luser/sccache2,glandium/sccache,mozilla/sccache,mozilla/sccache,glandium/sccache,mozilla/sccache,luser/sccache2