ffmpeg update fails

[Ryan Schmidt]

> On Mar 20, 2017, at 21:12, tome at qx.net wrote:
> 
> Mac mini 2.7Ghz Intel Core i7
> 8 GB 1333 Mhz DDR3
> Lion OS X 10.7.5
> ffmpeg @3.1.4_0+gpl2+x11 (active)
> 
> Attempting this update broke my ffmpeg.  Port update was successful.
> Please help.
> 
> Thank you,
> Tom<main.log>

This is the libarchive build failure we already know about.

https://trac.macports.org/ticket/53712