`ext/odbc/tests/config.inc` overrides the INIs used for the ODBC driver
manager pointlessly. It's not pointing to some custom PHP test suite
specific one, but the system one in `/etc/odbc(inst).ini`. Which
doesn't necessarily exist, on i.e. NixOS, MacPorts, etc.
Closes GH-12133
Signed-off-by: George Peter Banyard <girgias@php.net>