[xbmc] backport bump ffmpeg to 2.3.1
Add aml_support_hevc function and recognize S812 chip
BitstreamConverter: add hevc annex-b conversion

Original author: John Stebbins <jstebbins@jetheaddev.com>
[AMLCodec] Add HEVC support
Use reentrant localtime if available
ADD: add a fallback site for internet detection

Somehow, google might be blocked ("Great Wall", firewall, proxy).
Little chance anyone would care to block w3c ;)