Description:
------------
The build fails with -Werror=format-security


Reproduce code:
---------------
tk.c:736: error: format not a string literal and no format arguments
tk.c:743: error: format not a string literal and no format arguments


Expected result:
----------------
It should build.

Actual result:
--------------
Proposed fix:

--- tk.c        2004-11-14 19:07:32.000000000 +0100
+++ tk.c.oden   2009-01-04 15:14:35.000000000 +0100
@@ -733,14 +733,14 @@ static void php_tk_terminal(zval *return
                         * On arr?te l'execution en affichant une erreur fatale.
                         */
                        case RETURN_WIDGET:
-                               zend_error(E_ERROR, tk_return_value);
+                               zend_error(E_ERROR, "%s", tk_return_value);
                        break;

                        /* Autre, on affiche un avertissement
                         * et on retourne une valeur de type bool?en n?gatif, la commande a ?chou?.
                         */
                        default:
-                               zend_error(E_WARNING, tk_return_value);
+                               zend_error(E_WARNING, "%s", tk_return_value);

                                return_value->type = IS_BOOL;
                                return_value->value.lval = 0;