makerel should not add -uncommitted to tarballs

makerel should not add -uncommitted to tarballs

For some time now (I suspect since 691ce773f), makerel has always tried
to build releases as perl-5.x.y-uncommitted.tar.gz.  This always
confuses and/or panics new release engineers, who see the error before
the "don't worry, use -s ''" advice in the RMG.

This change just makes makerel skip the usually-#ifdef-ed-away line that
is getting that -uncommitted.  makerel still picks up other
locally-applied patches, but will skip uncommitted.