Skip bug_50755.phpt in repeat mode

This occasionally fails in repeat mode with:

> SQLSTATE[HY000]: General error: 20018 Transaction (Process ID 60)
> was deadlocked on lock resources with another process and has been
> chosen as the deadlock victim. Rerun the transaction.

Author: nikic

ext/pdo_dblib/tests/bug_50755.phpt

@@ -4,6 +4,7 @@ PDO_DBLIB: Out of memory on large recordsets
 pdo_dblib
 --SKIPIF--
 <?php
+if (getenv('SKIP_REPEAT')) die('skip May fail on repeat');
 require __DIR__ . '/config.inc';
 ?>
 --FILE--