Cycles microdisplacement: Move call to tessellate() from addon to Cycles

By calling `tessellate()` from the mesh manager in Cycles we can do pre/post
processing or even threaded tessellation without concerning client side code
with the details.

intern/cycles/subd/CMakeLists.txt

@@ -22,6 +22,7 @@ set(SRC
 set(SRC_HEADERS
 	subd_dice.h
 	subd_patch.h
+	subd_patch_table.h
 	subd_split.h
 )