Description:
Stellarium doesn't start, if sdl_mixer is not installed, although the package doesn't depend on it. The packages' dependencies don't depend on it either.

Additional info:
* tested with 0.9.1-1 from extra-repo
* happens only x86_64
* on x86_64, "ldd /usr/bin/stellarium | grep -i sdl" returns:
libSDL_mixer-1.2.so.0 => /usr/lib/libSDL_mixer-1.2.so.0 (0x00002ac52177b000)
libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x00002ac5237a1000)
* on i686, the same command returns nothing.


Steps to reproduce:
1.) make sure sdl_mixer is not installed
2.) pacman -S stellarium
3.) run stellarium:
stellarium: error while loading shared libraries: libSDL_mixer-1.2.so.0: cannot open shared object file: No such file or directory
4.) pacman -S --asdeps sdl_mixer
5.) stellarium works

btw: it doesn't depend on sdl either, which it should, IMHO. At least on x86_64.