Issue 345: use libffi built into gcc instead of builtin_apply

Reported by Nikolaus Schaller, Apr 3, 2012

http://sourceware.org/ml/libffi-discuss/2009/msg00016.html

this would make the NSMethodSignature and NSInvocation code more 
portable.

Comment 1 by Nikolaus Schaller, Apr 3, 2012

the gcc internal libffi is only used for gcj (java) and not easily 
available.

So better use libffi on the system:

https://github.com/atgreen/libffi/blob/master/doc/libffi.info

Debian Squeeze uses 3.0.9 (libffi5)

Comment 2 by Nikolaus Schaller, Apr 12, 2012

This is not sufficient since we have to convert forward:: into an 
NSInvocation. And this is beyond libffi.

Comment 3 by Nikolaus Schaller, May 14, 2012

Has been solved without libffi

Status: WontFix

mySTEP