Use glibc_likely instead __builtin_expect.

debug/vsnprintf_chk.c

@@ -33,7 +33,7 @@ ___vsnprintf_chk (char *s, size_t maxlen, int flags, size_t slen,
      Though, maxlen is supposed to be the size of buffer pointed
      to by s, so a conforming program can't pass such maxlen
      to *snprintf.  */
-  if (__builtin_expect (slen < maxlen, 0))
+  if (__glibc_unlikely (slen < maxlen))
     __chk_fail ();
 
   _IO_strnfile sf;