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

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

Commit: ec99e9aa110ab52fffa9053f504eeb42cfd493d2
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-05-18T17:04:59Z
Releases: 9.6.10
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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