Revert "packagegroup-gnome: add gnome-applets"

There is no gnome-appets recipes in meta-gnome

This reverts commit 0c3f8cfbaf95f5499bb18318cf798485dcc06742.
angstrom: Override OE-Core for  virtual/libgl PREFERRED_PROVIDER

Weaker define means OE-Core definition takes over and it results
in conflicts

ERROR: Multiple .bb files are due to be built which each provide
virtual/libgl
(/home/kraj/work/angstrom/sources/openembedded-core/meta/recipes-graphics/mesa/mesa-gl_9.1.6.bb
/home/kraj/work/angstrom/sources/openembedded-core/meta/recipes-graphics/mesa/mesa_9.1.6.bb).
 This usually means one provides something the other doesn't and should.

Signed-off-by: Khem Raj <raj.khem@gmail.com>