Clean up most of b/c for phpunit4

We don't support phpunit4 anymore:
https://w.wiki/9UT

Change-Id: Id7ad0e139f454becfac87bedca75b271250d387c

tests/phpunit/ResourceLoaderULSModuleTest.php

@@ -11,7 +11,6 @@ use ResourceLoaderULSModule;
  * @author Thiemo Kreuz
  */
 class ResourceLoaderULSModuleTest extends \PHPUnit\Framework\TestCase {
-	use \PHPUnit4And6Compat;
 
 	public function testAllReturnValues() {
 		$instance = new ResourceLoaderULSModule();