* configure.ac: Add packages.
* src/inst-kwindowsystem.nsi,
 src/inst-qtwinextras.nsi,
 src/uninst-kwindowsystem.nsi,
 src/uninst-qtwinextras.nsi: New.
* src/Makefile.am, src/inst-sections.nsi,
 packages/packages.current, src/config.nsi.in,
 src/gpg4win.mk.in: Update accordingly.