Disable lsan on new PDO firebird tests

There is a known leak in the firebird client library.

Also switch these to use EXTENSIONS.

Author: nikic

ext/pdo_firebird/tests/bug_76448.phpt

@@ -1,10 +1,10 @@
 --TEST--
 Bug #76448 (Stack buffer overflow in firebird_info_cb)
---SKIPIF--
-<?php
-if (!extension_loaded('pdo_firebird')) die("skip podo_firebird extension not available");
-if (!extension_loaded('sockets')) die("skip sockets extension not available");
-?>
+--EXTENSIONS--
+pdo_firebird
+sockets
+--ENV--
+LSAN_OPTIONS=detect_leaks=0
 --FILE--
 <?php
 require_once "payload_server.inc";

ext/pdo_firebird/tests/bug_76449.phpt

@@ -1,10 +1,10 @@
 --TEST--
 Bug #76449 (SIGSEGV in firebird_handle_doer)
---SKIPIF--
-<?php
-if (!extension_loaded('pdo_firebird')) die("skip pdo_firebird extension not available");
-if (!extension_loaded('sockets')) die("skip sockets extension not available");
-?>
+--EXTENSIONS--
+pdo_firebird
+sockets
+--ENV--
+LSAN_OPTIONS=detect_leaks=0
 --FILE--
 <?php
 require_once "payload_server.inc";

ext/pdo_firebird/tests/bug_76450.phpt

@@ -1,10 +1,10 @@
 --TEST--
 Bug #76450 (SIGSEGV in firebird_stmt_execute)
---SKIPIF--
-<?php
-if (!extension_loaded('pdo_firebird')) die("skip pdo_firebird extension not available");
-if (!extension_loaded('sockets')) die("skip sockets extension not available");
-?>
+--EXTENSIONS--
+pdo_firebird
+sockets
+--ENV--
+LSAN_OPTIONS=detect_leaks=0
 --FILE--
 <?php
 require_once "payload_server.inc";