Add appendinx about xbmc issues

XBMC won't boot because a different libtag version got
installed with mopidy system wide, and XBMC picks that up
insted of the one it vendors in. Added info how to fix this.
There is a very similar libtag issue with the xbian distribution but the
dependency problem there prevents you from installing mopidy in the first
place. The hack to get around the issue is, or at least the one I've used,
is very different. This should probably be mentioned here else it'll lead
xbian people down the wrong path.
On 3 Dec 2014 20:43, "Stein Magnus Jodal" <notifications@github.com> wrote:

> In docs/installation/raspberrypi.rst:
>
> > @@ -141,3 +141,30 @@ not determined the exact revision that fixed this::
> >  The only remaining known issue is a slight gap in playback at track changes
> >  this is likely due to gapless playback not being implemented and is being
> >  worked on irrespective of Raspberry Pi related work.
> > +
> > +
> > +Appendix B: XBMC not booting?
> > +=============================
> > +
> > +A very important note for RaspBMC users. Due to a dependency version problem,
> > +you might have to make some minor configurations for XBMC to start properly
> > +(this depends on your system’s version).
> > +
> > +If you notice that XBMC is not starting but gets stuck in a loop,
> > +you need to make these configurations.
> > +In short, what you have to do is the following:
> > +
> > +    sudo ln -sf /home/pi/.xbmc-current/xbmc-bin/lib/xbmc/system/libtag.so.1 /usr/lib/arm-linux-gnueabihf/libtag.so.1
>
> This would be better broken over two lines with \ newline escape so it
> still can be copy-pasted into a shell.
>
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