[Bug c/116545] Support old style statement attributes

[lucier at math dot purdue.edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116545

--- Comment #6 from lucier at math dot purdue.edu ---
(In reply to Jakub Jelinek from comment #4)
> 
> does that for C.

I built mainline with these changes, and the resulting compiler builds Gambit
without complaint or error.

I'm now running make check on mainline with your change.