Rewrite ECPG regression test driver in C, by splitting the standard
Magnus Hagander <magnus@hagander.net>
Rewrite ECPG regression test driver in C, by splitting the standard regression driver into two parts and reusing half of it. Required to run ECPG tests without a shell on MSVC builds. Fix ECPG thread tests for MSVC build (incl output files). Joachim Wieland and Magnus Hagander