vd_lavc: better hwdec wrapper decoder selection

This is intended for cases when --hwdec needs to override the decoder
implementation in use, like for example on the RPI.

It does two things:
1. Allow the hwdec to indicate a decoder suffix. libavcodec by
   convention adds a suffix to all wrapper decoders, and here we start
   relying on it. While not necessarily the best idea, it's the only
   thing we got. libavcodec's hwaccel list is useless, because it only
   has the codec ID, not the associated decoder's name.
2. Make --hwdec=auto work properly. It shouldn't fail anymore, and hwdec
   probing should reliably work, even if a different decoder is selected
   with --vd. The semantics of --hwdec should dictate that it overrides
   the default decoder.

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