Check that we have a working tar before trying to use it
Issue exposed by commit edc2332550 and the buildfarm.
Backpatch to release 14 where this usage started.
Branch
------
REL_14_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/90c08ed11332b766769b2e5ba114fb7ecb34e401
Modified Files
--------------
src/bin/pg_basebackup/t/010_pg_basebackup.pl | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)