added missing constant CACA_KEY_UNKNOWN

caca-php/php_caca.c

@@ -261,6 +261,7 @@ PHP_MINIT_FUNCTION(caca) {
 	REGISTER_LONG_CONSTANT("CACA_EVENT_QUIT", CACA_EVENT_QUIT, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CACA_EVENT_ANY", CACA_EVENT_ANY, CONST_CS | CONST_PERSISTENT);
 
+	REGISTER_LONG_CONSTANT("CACA_KEY_UNKNOWN", CACA_KEY_UNKNOWN, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CACA_KEY_CTRL_A", CACA_KEY_CTRL_A, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CACA_KEY_CTRL_B", CACA_KEY_CTRL_B, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CACA_KEY_CTRL_C", CACA_KEY_CTRL_C, CONST_CS | CONST_PERSISTENT);