Add patch to fix kleopatra crash on exit

* Makefile.am (EXTRA_DIST): Package patch.
* patches/kconfigwidgets/0001-Fix-crash-on-exit-on-Windows.patch: New.
* patches/kconfigwidgets/0001-Fix-crash-on-exit-on-Windows.patch-next:
Patch against current master with refactored class.

This adds a patch to fix the crash on exit for Kleopatra. The
-next version is added for reference because the next update of
Frameworks will need the -next patch.
For more info see:

• GnuPG-Bug-Id: T5962