This matrix was used to store the space the object is in,
which then was accessed by snapping code. No reason to
keep it as a global variable (which isn't safe for threading,
unlikely it'll give issues now, but it's easy to avoid
issues early here).
Now made it so BKE_object_where_is_calc_ex will get an
optional parameter originmat and set this matrix in
solve_parent.
Original patch by self, minor changes by Campbell, thanks!
da0ea30866