[Paraview] Required CMake version 3.5

[Christoph Grüninger]

Hi Ben,

> I think the easiest way to check this would be to set the minimum to 3.3
> and run against 3.5 to see if any POLICY warnings are triggered for the
> way openSUSE builds ParaView. If they are, the old version is probably
> silently doing something wrong.

I just did exactly that, no warning from CMake occurs. So we can assume
everything would be fine with CMake 3.3. Should I create an according
Github merge request?

Bye
Christoph