Fix compiler warnings in ecpg tests

Peter Eisentraut <peter@eisentraut.org>

Commit: 517bf2d9107f0d45c5fea2e3904e8d3b10ce6bb2
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-10-29T08:38:18Z
Releases: 13.0
Fix compiler warnings in ecpg tests

Under MinGW, when compiling the ecpg test files, you get compiler
warnings about the use of %lld in printf().

These files don't use our printf replacement or the c.h porting layer,
so determine the appropriate format conversion the hard way.

Reviewed-by: Michael Meskes <meskes@postgresql.org>
Discussion: https://www.postgresql.org/message-id/flat/760c9dd1-2d80-c223-3f90-609b615f7918%402ndquadrant.com

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