Add get_query_var() wrapper for $wp_query->get().

git-svn-id: https://develop.svn.wordpress.org/trunk@1517 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/functions.php

@@ -1580,6 +1580,12 @@ function is_home () {
     return $wp_query->is_home;
 }
 
+function get_query_var($var) {
+  global $wp_query;
+
+  return $wp_query->get($var);
+}
+
 function have_posts() {
     global $wp_query;