001_libpq_pipeline.pl: use Test::Differences if available

When one of these tests fails to match the trace, this better shows what
the problem is.

Discussion: https://postgr.es/m/[email protected]
Reviewed-by: Kyotaro Horiguchi <[email protected]>

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/87e4f24d82939ef532b68f37fc66e6a48cff2cd9

Modified Files
--------------
src/test/modules/libpq_pipeline/README                  |  3 +++
src/test/modules/libpq_pipeline/t/001_libpq_pipeline.pl | 15 ++++++++++++++-
2 files changed, 17 insertions(+), 1 deletion(-)

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