Missing dependency check in

[Rex Dieter]

Cyrille Berger Skott wrote:

> On Thursday 25 Oct 2012, Thorsten Zachmann wrote:
>> seems like we are not checking for the dependency on
>> 
>> libphononexperimental-dev
> 
> On a side note, depending on phonon experimental is probably a bad idea, I
> am a bit skeptical whether distributions are going to accept that (I am
> going to ask).
> 
> And in any case, we need a check, and then disable stuff as needed.

Looks like PhononConfig.cmake defines PHONON_FOUND_EXPERIMENTAL, so should 
be easy enough...

-- rex