[Bug libffi/64572] r219477 breaks bootstrap on x86_64 darwin

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64572

--- Comment #26 from howarth at bromo dot med.uc.edu ---
(In reply to Richard Henderson from comment #25)

Thanks for applying the fix to trunk. FYI, the current state of libffi head on
x86_64-apple-darwin14 is described in...

https://sourceware.org/ml/libffi-discuss/2015/msg00019.html

Any suggestions for fixing the compilation of sysv,S on darwin would be
welcome.