Add some test coverage for ecpg's "long long" support.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 9d6616708d3f6bf771fa7d64527e48908c5a5838
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-05-18T17:04:59Z
Releases: 9.5.14
Add some test coverage for ecpg's "long long" support.

This will only actually exercise the "long long" code paths on platforms
where "long" is 32 bits --- otherwise, the SQL bigint type maps to
plain "long", and we will test that code path instead.  But that's
probably sufficient coverage, and anyway we weren't testing either
code path before.

Dang Minh Huong, tweaked a bit by me

Discussion: https://postgr.es/m/151935568942.1461.14623890240535309745@wrigleys.postgresql.org

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