Remove code for PHP < 5.4

Signed-off-by: Michal Čihař <michal@cihar.com>

libraries/common.inc.php

@@ -82,17 +82,6 @@ $PMA_String = new PMA_String();
  */
 $GLOBALS['error_handler'] = new ErrorHandler();
 
-/**
- * This setting was removed in PHP 5.4. But at this point PMA_PHP_INT_VERSION
- * is not yet defined so we use another way to find out the PHP version.
- */
-if (version_compare(phpversion(), '5.4', 'lt')) {
-    /**
-     * Avoid problems with magic_quotes_runtime
-     */
-    @ini_set('magic_quotes_runtime', 'false');
-}
-
 /**
  * core functions
  */