Fix PDO_Firebird tests for 32bit

These tests are failing because the integers are too large to be cast
to a PHP int.  We fix this by expecting either an int or a string.

Closes GH-16278.

Author: cmb69

ext/pdo_firebird/tests/bug_15604.phpt

@@ -64,11 +64,11 @@ $dbh = getDbConnection();
 @$dbh->exec('drop sequence g_bug_15604');
 unset($dbh);
 ?>
---EXPECT--
+--EXPECTF--
 bool(false)
 array(3) {
   ["ID"]=>
-  int(2)
+  %r(int\(2\)|string\(1\) "2")%r
   ["A"]=>
   int(2)
   ["B"]=>

ext/pdo_firebird/tests/fb4_datatypes.phpt

@@ -49,7 +49,7 @@ echo "\ndone\n";
 ?>
 --EXPECTF--
 {
-    "I64": 15,
+    "I64": %r(15|"15")%r,
     "I128": "15",
     "N": "123.97",
     "N2": "123.97",