paraview: enforce building against Qt5 even when Qt6 is available
When testing against system qt, and when both qt5 and qt6 are available, Qt6 is favored. This change explicitly forces the use of Qt5.
Edited by Sankhesh Jhaveri
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When testing against system qt, and when both qt5 and qt6 are available, Qt6 is favored. This change explicitly forces the use of Qt5.