Drop ancient PHP4 wrapper for cloning, completely unused

includes/GlobalFunctions.php

@@ -261,15 +261,6 @@ function wfArrayDiff2_cmp( $a, $b ) {
 	}
 }
 
-/**
- * Wrapper for clone(), for compatibility with PHP4-friendly extensions.
- * PHP 5 won't let you declare a 'clone' function, even conditionally,
- * so it has to be a wrapper with a different name.
- */
-function wfClone( $object ) {
-	return clone( $object );
-}
-
 /**
  * Seed Mersenne Twister
  * No-op for compatibility; only necessary in PHP < 4.2.0