This reverts commit f9c2bcc8.  Drawing all sorts
of curves and polygons in Draw causes various crashes in
svx/source/svdraw/svdopath.cxx, apparently because in the past ImpXPolygon's
pPointAry had a "buffer" of more elements (nSize) than it had nPoints, and the
code heavily relied on that, assigning to such excess elements of pPointAry past
nPoints (and presumably calling XPolygon::SetPointCount later?).

Conflicts:
	svx/source/xoutdev/_xpoly.cxx
(Reverted the mostly, if not completely, automatic changes there done by
924c0e34 "loplugin:changetoolsgen in svx"; they
will need to be re-done.)

Change-Id: I6cb41fd218c3bdd0b3bbeb45f5b3d68649901a48
Reviewed-on: https://gerrit.libreoffice.org/50057Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>