Fix Qt license file location
Fix Qt license file location, which was relative to the root of the superbuild, which do not work when using paraview superbuild inside another superbuild
Backport: release
Edited by Mathieu Westphal (Kitware)
Fix Qt license file location, which was relative to the root of the superbuild, which do not work when using paraview superbuild inside another superbuild
Backport: release