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

[Torbjörn Jansson]

hi

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.

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