Coordinating libffi upgrade

[Colin Walters]

On Fri, 2012-11-02 at 16:04 -0400, Adam Jackson wrote:

> It looks like libffi is emitted into the minimal buildroot (rpm-build -> 
> pkg-config -> glib2 -> libffi), so during the transition we'll need to 
> build both sonames of libffi.  It might be worth keeping a compat-libffi 
> around for a release or two anyway, the current soname has a _long_ history.

Or just apply the patch from here:
http://lists.fedoraproject.org/pipermail/devel/2012-April/165871.html
And skip tons of pain for all the libffi consumers at the tiny cost of a
stub symbol.

Hm, no links to the patch in the archives.  Well, I'll attach it again,
since I still have it sitting around in my libffi git checkout.