libqxt-0.6.2-bp150.2.4

- Add two patches to allow proper building
  * libqxt-use-system-qdoc3.patch
  * libqxt-xrandr-missing-lib.patch
- Disable libdb integration as we want to remove it from distribution

-`spec-cleaner`.
- Updated Url & BuildRequires tags.
- Added libqxt-gcc6.patch to resolve bnc#985109.
- Enabled verbose make output.
- Required xrandr & zeroconf to resolve configure time warnings.

- Added libqxt-media-keys.patch to support multimedia keys.
  http://dev.libqxt.org/libqxt-old-hg/issue/75
- Added libqxt-event-filters.patch to respect X11 event filters.
  http://dev.libqxt.org/libqxt/pull-request/41

- changed package name to libqxt, to avoid future changes of soname

- LibQxt is an extension library for Qt providing a suite of
  cross-platform utility classes to add functionality not readily available
  in the Qt toolkit by Trolltech, a Nokia company.