This commit avoids duplicating the deformed control point
list twice by modifying the list in the object curve cache directly.
For curves, the original control point data was duplicated into a
local listbase, deformed, used to create the "bevel list" data, and
then duplicated again for the object-level storage of deformed
control points. Text objects and surface objects had a similar
unnecessary duplication.
f8d8f28e2c