[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 #1 from lucier at math dot purdue.edu ---
A pre-release of GCC 15 is now in Fedora Rawhide, and building Gambit Scheme
fails with this issue: https://github.com/gambit/gambit/issues/949