[Bug libffi/84410] libffi doesn't support riscv now, but not disabled in configure.ac

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84410

Jim Wilson <wilson at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-02-16
                 CC|                            |wilson at gcc dot gnu.org
     Ever confirmed|0                           |1