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

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

Commit: e75c832b29b1ffbf1737915be9d9940162524fef
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-05-18T17:04:59Z
Releases: 9.4.19
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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