libffi fixes

[Alan Hourihane]

Hello,

I've been porting libffi to an alternative m68k platform and bumped into 
a couple of generic issues.

Andreas Schwab has found one problem with the 68881 detection. Patch 
attached.

A second problem, also attached is to fix the err_bad_abi.c test on m68k.

And finally a third patch is to fix the return_sc.c test when using GCC 
optimizations on m68k.

I'll be cleaning up the new ABI soon and submitting that as well.

Let me know if there's any issues with these.

Many thanks,

Alan.
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