Blender Git Loki

Bugfix #4066

Particle strands with a width set (like 10 pixels), and with extreme
bending of strands (like a very course subdivision), could create non-flat
quads. For speed reasons, the quad-to-triangle splitting was turned off
for hair, but in this case that should be done nevertheless.

Solves another Dandruff issue for furry bunnies!