Fix tests when executed outside of srcroot

Fixes running tests with pecl run-tests -p mongodb and on windows

Author: bjori

tests/standalone/result-toArray-001.phpt

@@ -1,10 +1,10 @@
 --TEST--
 MongoDB\Driver\Result::toArray()
 --SKIPIF--
-<?php require "tests/utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
 --FILE--
 <?php
-require_once "tests/utils/basic.inc";
+require_once __DIR__ . "/../utils/basic.inc";
 
 $manager = new MongoDB\Driver\Manager(STANDALONE);
 

tests/standalone/result-toArray-002.phpt

@@ -1,10 +1,10 @@
 --TEST--
 MongoDB\Driver\Result::toArray() respects type map
 --SKIPIF--
-<?php require "tests/utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
 --FILE--
 <?php
-require_once "tests/utils/basic.inc";
+require_once __DIR__ . "/../utils/basic.inc";
 
 class MyArrayObject extends ArrayObject implements BSON\Unserializable
 {