libffi Darwin support

[David Edelsohn]

>>>>> =?ISO-8859-1?Q?John H=F6rnkvist?= writes:

John> Two questions, then:
John> What is the proper name of the ABI?

	The ABI really is called the AIX ABI.  There is a descendant
called the PowerOpen ABI which changed a few things, but neither AIX nor
Darwin follow the PowerOpen ABI.

John> Are you able to test that your changes don't break on Darwin/Mac OS X?

	I am not changing anything, unless we try to merge the two
assembly files.  The only thing I might want to change in ffi_darwin.c is
to use sizeof(long) instead of sizeof(int) for stack offsets.

David