load gallery module before the rest of the modules, fix corresponding test

lib/preload_opcache.php

@@ -1,4 +1,4 @@
-<?php defined("SYSPATH") or die("No direct script access.");
+<?php
 /**
  * Gallery - a web based photo album viewer and editor
  * Copyright (C) 2000-2013 Bharat Mediratta
@@ -39,6 +39,7 @@ function getfiles( $path , &$files = array() ) {
 $preload_dirs = [
 	'application',
 	'system',
+	'modules/gallery',
 	'modules',
 	'themes',
 ];

modules/gallery/tests/File_Structure_Test.php

@@ -181,6 +181,7 @@ class File_Structure_Test extends Gallery_Unit_Test_Case {
         // SWF wrappers - directly accessible
         break;
 
+      case DOCROOT . "lib/preload_opcache.php":
       case DOCROOT . "local.php":
         // Special case optional file, not part of the codebase
         break;