0.6.2 does not build in OGDF mode

[danfe]

Version 0.6.2 does not build in OGDF mode, compilation fails with the following error:

CImportExportUIController.cpp:263:50: error: non-const lvalue reference to type 'CNodeEditorScene' cannot bind to a value of unrelated type 'CEditorScene'
        return (COGDFLayout::loadGraph(fileName, scene, lastError));
                                                 ^~~~~
../../src/commonui/ogdf/COGDFLayout.h:32:70: note: passing argument to parameter 'scene' here
    static bool loadGraph(const QString &filename, CNodeEditorScene &scene, QString* lastError = nullptr);

This is on FreeBSD and Clang 11.0.0.

[ArsMasiuk]

must be fixed in trunk as well

[danfe]

Technically though, #139 should be labeled the duplicate. ;-)