pgsql: Fix TAP tests with Perl 5.12

Fix TAP tests with Perl 5.12

Perl 5.12 ships with a somewhat broken version of Test::Simple, so skip
the tests if that is found.

The relevant fix is

0.98 Wed, 23 Feb 2011 14:38:02 +1100
Bug Fixes
* subtest() should not fail if $? is non-zero. (Aaron Crane)

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/17009fb9ebe6873d98ed0fe216eeec08e0603823

Modified Files
--------------
src/test/perl/TestLib.pm | 8 ++++++++
1 file changed, 8 insertions(+)

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