removed HHVM support

Author: fabpot

Iterator/RecursiveDirectoryIterator.php

@@ -132,11 +132,6 @@ public function isRewindable()
             return $this->rewindable;
         }
 
-        // workaround for an HHVM bug, should be removed when https://github.com/facebook/hhvm/issues/7281 is fixed
-        if ('' === $this->getPath()) {
-            return $this->rewindable = false;
-        }
-
         if (false !== $stream = @opendir($this->getPath())) {
             $infos = stream_get_meta_data($stream);
             closedir($stream);