new smatch

*** 1,9 ****
  static int foo(void) __attribute__((unknown_attribute));
  
  /*
   * check-name: warn-unknown-attribute
-  *
-  * check-error-start
- Wunknown-attribute-def.c:1:37: warning: attribute 'unknown_attribute': unknown attribute
-  * check-error-end
   */
--- 1,5 ----