in CoreText

by doing the calculation before CTLineDraw() updates the text position.
Requesting the update early is possible because that update region is
not used until AquaSalInstance::Yield().
(cherry picked from commit ee042661)

Conflicts:
	vcl/aqua/source/gdi/ctlayout.cxx

Change-Id: I317a2068071a2f6d33f34c81e104e30beedc33db