[mythtv] update cec support to work with v2 of libcec

[Torbjörn Jansson]

> At 4:50 PM +0200 6/9/13, Torbjörn Jansson wrote:
> >i got tired of mythtv not working with latest version of libcec so i
> made a
> >few changes, see attached patch.
> >there is no new features.
> >
> >patch is against fixes/0.26 but i suspect not much have changed with
> cec in
> >latest dev tree so it probably can be applied easily there too.
> 
> Have you coordinated with a dev on this?  If not,
> you're probably better to open a ticket so your
> work doesn't get forgotten...
> 
> Craig

no i haven't coordinated anything.
this patch was just the result of an hour or two hacking on the code today.