Thunderbird bz 579023 still not fixed even though there is an upstream fix available

[Bill Nottingham]

Christopher Aillon (caillon at redhat.com) said: 
> This option doesn't exist because it's impossible to use right now. 
> Just adding a --with-libffi doesn't actually make it useful since the 
> minimum required version of libffi hasn't been released yet, and libffi 
> releases don't come out that frequently.  Note that a large portion of 
> the patchset between the latest libffi release and latest HEAD has come 
> from Mozilla, who have pushed all their changes upstream and have had 
> them merged successfully, and there are still more changes in the pipeline.

At least in F-13, we ship libffi-3.0.9, and the xulrunner-included version
claims to be 3.0.8. Of course, older releases may be a different story.

Bill