2.1.4 Fixes warning about static functions

git-svn-id: https://plugins.svn.wordpress.org/simple-cart-buy-now/trunk@1001885 b8457f37-d9ea-0310-8a92-e5e31aec5664
One more static function

git-svn-id: https://plugins.svn.wordpress.org/simple-cart-buy-now/trunk@1001886 b8457f37-d9ea-0310-8a92-e5e31aec5664