[oe] preferred-provider at the image level a.k.a why is all this fso stuff in my non-fso image

[Sergey Lapin]

I just need to mention we have same kind of problems with mplayer vs
mplayer-maemo recipe,
when you try to put e.g. mencoder into IMAGE_INSTALL, mplayer-maemo
recipe is used instead of mplayer one.
Also, which is weird, I was able to reproduce this lots of times on
one my setup even with build from scratch,
and was unable to do so with my another setup.

All the best,
S.