Patch file is attached.  I have no experience building or 
packaging GCC, so any feedback is appreciated.  That being said, I 
_believe_ this recipe follows the build instructions at 
https://gcc.gnu.org/onlinedocs/jit/internals/index.html#packaging-notes 
correctly.

This is toward the eventual goal of packaging gccemacs 
(https://akrl.sdf.org/gccemacs.html).

--
Joseph LaFreniere