cmake: Simplify VTK external project: Qt and Python are not needed
cmake: Simplify VTK external project: Qt and Python are not needed

NIRALUser/SPHARM-PDM,bpaniagua/SPHARM-PDM,NIRALUser/SPHARM-PDM,bpaniagua/SPHARM-PDM,bpaniagua/SPHARM-PDM,NIRALUser/SPHARM-PDM