Patch to support libmarblewidget-qt5

[Rex Dieter]

Since marble commit:
https://projects.kde.org/projects/kde/kdeedu/marble/repository/revisions/ac91cf9f27c355754fd7e8c6df9256a753cb8545

to make qt4/qt5 libmarblewidget builds parallel-installable, changes are 
required to link libmarblewidget-qt5

Here's a reference to the fix we are currently using in fedora to adapt 
subsurface to this new scheme:

http://pkgs.fedoraproject.org/cgit/subsurface.git/tree/Subsurface-4.4.1-marblewidget-qt5.patch

-- Rex