Blender Git Loki

Change fix for T44530 which caused a "regression".

Looks like the previous commit here is really correct and fixes cases of
distortion that were in mirror-subsurf combination since blender 2.5.

This may cause some changed files in which case we will be adding an
option, but it is expected this will only happen with low res models,
and hand painted textures, and the better distortion here compensates
for that enough to consider not adding a compatibility option yet.

Leaving the facemap winding argument as is just in case we do consider
to add the option.