Grep'ing the Qt source code, most of the places call toInt()
on the QVariants returned from Qt::ImCursorPosition and
Qt::ImAnchorPosition (toUInt() is probably a bug). So actually
deliver these (and fix the 32bit build with the sal_Int32
ambiguity - there is no "signed long" QVariant constructor).

Change-Id: Id6b8fbabb8156692592bdef48437db140c6b7cca
Reviewed-on: https://gerrit.libreoffice.org/73349
Tested-by: Jenkins
Tested-by: Rene Engelhard <rene@debian.org>
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>