"make check" should detect which PostgreSQL instance to use from pg_config - Part 2

[bowguy]

From ​https://trac.osgeo.org/postgis/ticket/186

'Currently "make check" requires createdb, psql, and dropdb to be on the user's path. If more than one instance of PostgreSQL has been installed on a system this is problematic.

configure already detected which PostgreSQL instance to build against … why not prefix the binaries with BINDIR found in pg_config rather than relying on what may or may not exist in one's PATH.'

[bowguy]

I ran this on Debian and worked fine. I added the code for MingW but did not test that.

[strk]

In 17339:

Ensure "make check" uses configured PostgreSQL target bins

Closes #4349
Patch by Bruce Rindahl

[strk]

In 17340:

Ensure "make check" uses configured PostgreSQL target bins under regress too

References #4349