[packman] Multimedia/cmus package issues

[Martin Herkt]

First off, this desperately needs an update (if only to get support for recent 
avformat), although upstream wouldn’t release anything new…

Project URL needs to be fixed (it’s https://cmus.github.io/), and there are 
some mistakes in the descriptions:

Main package:
- remove (via libmad) as the package is not even built with libmad support.
  (For the record: libmad has terrible output quality as it uses dumb linear 
  sample interpolation to get signed integer output).
- remove mentions of irrelevant output plugins (aRTS, SUN)
- maybe even remove the formats entirely, since the plugins are separate
  packages anyway

All plugin packages:
s/proves/provides/

plugin-opus:
s/MPC (Musepack)/Opus/ (including Summary:)

Also, the aac plugin needs a few %if %{with faad}.
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