Fix broken test, we should continue the discussion on fixing this in less#331 rather than break the tests

Author: lukeapage

test/css/import-once.css

@@ -1,4 +1,6 @@
 @import "import-test-d.css";
+
+@import "../import-test-d.css";
 #import {
   color: #ff0000;
 }