[Bug c/37743] Bogus printf format warning with __builtin_bswap32.

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37743

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 32173
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32173&action=edit
gcc49-pr37743.patch

Untested fix.  The deprecation can hopefully be done separately.