Move login check in inc/mod/auth.php to a function

This allows pages like create.php to not include inc/mod/pages.php while still being able to use the mod auth functions (like generating salts and passwords)

post.php

@@ -216,6 +216,7 @@ if (isset($_POST['delete'])) {
 
 	if ($post['mod'] = isset($_POST['mod']) && $_POST['mod']) {
 		require 'inc/mod/auth.php';
+		check_login(false);
 		if (!$mod) {
 			// Liar. You're not a mod.
 			error($config['error']['notamod']);