pgsql: pg_regress: Allow overriding diff options

pg_regress: Allow overriding diff options

By setting the environment variable PG_REGRESS_DIFF_OPTS, custom diff
options can be passed.

reviewed by Jeevan Chalke

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/574f7643214d8381a03083ffbb08ecceec44d6b2

Modified Files
--------------
doc/src/sgml/regress.sgml | 5 ++++-
src/test/regress/pg_regress.c | 3 +++
2 files changed, 7 insertions(+), 1 deletions(-)

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