Review Request: Fix FindXine.cmake to use pkg-config instead of xine-config

[Alexander Neundorf]

On Friday 06 January 2012, Rolf Eike Beer wrote:
> > - remove the if(WIN32)
> > around the pkgconfig-stuff. People say it should work also on Windows. So
> > let's see.
> 
> But add an if() to check if pkg-config is actually found?

If it's not found, the call to the macro simply does not set any variables, so 
no problem.

Alex