Update libqt5xdg to 3.3.1 to rebuild it against the new Qt version in SLE15 SP2,
since libqt5xdg uses Qt's private API (jsc#SLE-8085).

- Update to 3.3.1:
  * Silenced compiler warnings about not used variables.
  * Dropped not needed MOC stuff, we already use CMAKE_AUTOMOC.
  * Dropped using libqtxdg's own versions of things that are in
    lxqt-build-tools
  * Updated translations

- Update to 3.3.0:
  * Use C++ ISO Standard 14, removed support for < 14
  * XdgDesktopFile: Simplify scheme handling
  * XdgDesktopFile: Clear internal data before loading a new file
  * XdgDesktopFile: Don’t try read non existent files
  * xdgaction: Set icon in updateIcon() only if needed
  * xdgiconloader: Support more classes for “FollowColors” icons
  * xdgiconloader: Consider device pixel ratio when painting
  * xdgiconloader: Cover all KDE colors schemes for symbolic icons
  * xdgiconloader: Fixes pedantic warning
  * xdgmenuwidget: Fix menu-item drag url

- Update to 3.2.0:
  * xdgiconloader: Add GTK cache revalidation (fixes finding and
    showing new icons, especially in main menu)
  * xdgiconloader: Cache ScalableFollowsColorEntry properly
  * Set genericName as tooltip (for main menu)
  * Fix symbolic SVG icons with Qt >= 5.10

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