Load: No-op `locale.php`

After re-adding `locale.php` in [39455], remove the content of the file so that it can't cause errors in the event of something loading it early in the WordPress load process.

See #39027.



git-svn-id: https://develop.svn.wordpress.org/trunk@39456 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/locale.php

@@ -8,20 +8,3 @@
  */
 
 _deprecated_file( basename( __FILE__ ), '4.7.0' );
-
-/** WP_Locale class */
-require_once ABSPATH . WPINC . '/class-wp-locale.php';
-
-/**
- * Checks if current locale is RTL.
- *
- * @since 3.0.0
- *
- * @global WP_Locale $wp_locale
- *
- * @return bool Whether locale is RTL.
- */
-function is_rtl() {
-	global $wp_locale;
-	return $wp_locale->is_rtl();
-}