We don't need git-config or other commands failing loudly.
`git clone' and subcommands it spawns may still spew, but it's no
worse than interrupting `git clone' itself, now.
We accomplish this by localizing $LIVE (formerly %LIVE) and
detecting when its auto-vivification into a hashref goes
out-of-scope during the `DESTRUCT' ${^GLOBAL_PHASE}.
We can't use ${^GLOBAL_PHASE}, yet, either, since it appeared in
Perl 5.14 and we're still migrating slowly to Perl 5.12 before
going to 5.14.