Set ULS_VERSION when using extension registration

This unbreaks Translate and CleanChanges who depend on the constant.

Change-Id: I8bfb9e2aaeb77351beefb130f71daeee4e07afae

UniversalLanguageSelector.hooks.php

@@ -19,6 +19,11 @@
  */
 
 class UniversalLanguageSelectorHooks {
+	// Used when extension registration in use which skips the main php file
+	public static function setVersionConstant() {
+		define( 'ULS_VERSION', '2015-06-08' );
+	}
+
 	/**
 	 * Whether ULS user toolbar (language selection and settings) is enabled.
 	 *

extension.json

@@ -88,6 +88,7 @@
 		"@ULSCompactLinks": "Whether the \"Compact language links\" Beta Feature is exposed. Requires $wgULSPosition to be \"interlanguage\". Defaults to false. @since 2014.03",
 		"ULSCompactLinks": false
 	},
+	"callback": "UniversalLanguageSelectorHooks::setVersionConstant",
 	"ResourceModules": {
 		"ext.uls.languagenames": {
 			"class": "ResourceLoaderULSModule"