We can save future testers some time if we bail out early
on "git init --shared" failures, since things like seccomp
or non-POSIX FSes would trigger failures.
BAIL_OUT has been in Test::Simple since Perl v5.10.0, so it's
old-enough to call for our purposes.
Thanks-to: Alyssa Ross <hi@alyssa.is>
Reviewed-by: Alyssa Ross <hi@alyssa.is>
Tested-by: Alyssa Ross <hi@alyssa.is>
Link: https://public-inbox.org/meta/878sq2hd08.fsf@alyssa.is/