paraview: optionally depend on `threedxwaresdk`
Without this, the SDK might be detected as being enabled but not built first.
See: https://gitlab.kitware.com/paraview/paraview-superbuild/-/jobs/9397399#L9603
A GitLab update will be applied on May 9th, between 8am and 10am, EDT (UTC-04:00). This site may have intermittent delays during that time.
Without this, the SDK might be detected as being enabled but not built first.
See: https://gitlab.kitware.com/paraview/paraview-superbuild/-/jobs/9397399#L9603