ParaView uses too much memory when compiling with make because of VTK-m

When compiling ParaView, the maximum memory usage is 2Gb by parallel threads, when VTK-m compilation occurs. This means that on a standard low-end desktop computer, 8 core, 8Gb of RAM, running make -j 8 will definitely swap and probably never finish. Ninja seems to be able to mitigate the issue by monitoring the memory usage I guess.

See the associated issue here : vtk/vtk-m#438 (closed)

Until this is resolved, we may want to consider disabling VTK-m by default, unless there is a way to prevent VTK-m to be built in parallel even when the rest of ParaView is.

Any ideas @cory.quammen @utkarsh.ayachit @ben.boeckel ?