ODBC unit tests shouldn't override odbc.ini location

`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>

Author: NattyNarwhal

ext/odbc/tests/config.inc

@@ -1,8 +1,5 @@
 <?php
 
-putenv('ODBCINI=/etc/odbc.ini');
-putenv('ODBCSYSINI=/etc');
-
 $dsn  = getenv("ODBC_TEST_DSN");
 $user = getenv("ODBC_TEST_USER");
 $pass = getenv("ODBC_TEST_PASS");