fix [#34657] Smoothing will not be updated in object mode, when hiding faces in edit mode and changing shape.
remove the option to skip hidden faces in BM_mesh_normals_update, use openmp to speedup recalculation for high poly meshes.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56258 954f8c5b-7b00-dc11-b283-0030488c597c