Mark zend_timeout as noreturn

Otherwise we get a compiler warning...

Author: nikic

Zend/zend_execute.h

@@ -288,7 +288,7 @@ ZEND_API zend_bool zend_is_executing(void);
 
 ZEND_API void zend_set_timeout(zend_long seconds, int reset_signals);
 ZEND_API void zend_unset_timeout(void);
-ZEND_API void zend_timeout(int dummy);
+ZEND_API ZEND_NORETURN void zend_timeout(int dummy);
 ZEND_API zend_class_entry *zend_fetch_class(zend_string *class_name, int fetch_type);
 ZEND_API zend_class_entry *zend_fetch_class_by_name(zend_string *class_name, const zval *key, int fetch_type);
 void zend_verify_abstract_class(zend_class_entry *ce);

Zend/zend_execute_API.c

@@ -1186,7 +1186,7 @@ ZEND_API int zend_eval_string_ex(char *str, zval *retval_ptr, char *string_name,
 
 static void zend_set_timeout_ex(zend_long seconds, int reset_signals);
 
-ZEND_API void zend_timeout(int dummy) /* {{{ */
+ZEND_API ZEND_NORETURN void zend_timeout(int dummy) /* {{{ */
 {
 	EG(timed_out) = 0;
 	zend_set_timeout_ex(0, 1);