[RFA/RFT] libffi reorg (take 2)

[Andreas Tobler]

Paolo Bonzini wrote:

>>Fine, works here with some modifications.
> 
> 
> Please send.

You'll get them if they are ready.
For the moment I still try to understand.

>>Why do you exchange the size tests with the *_MAX checks?
> 
> 
> Because unlike size tests, using macros in limits.h does not pollute the
> namespace.  Including fficonfig.h is bad, especially with my autoupdated
> version of libffi which puts some defines in it which are *not*
> package-independent (such as PACKAGE and VERSION).

I see, unfotunately LONG_LONG_MAX is a bit a mess here. Have to find out 
  how it goes.

Andreas