[Paraview] Color legend not working properly

[Ben Boeckel]

On Thu, Apr 27, 2017 at 17:04:24 +0000, Lawson, Joel M. wrote:
> It worked! Thank you very much.
> Out of curiousity, what does the --mesa option do?

We build Mesa as part of our packages and place the required libraries
under `lib/paraview-5.3/mesa`. The `--mesa` flag just adds that
directory to `LD_LIBRARY_PATH` before executing the real ParaView
binary and potentially sets `GALLIUM_DRIVER` if you use one of the
`--mesa-*` flags:

    https://gitlab.kitware.com/paraview/paraview/blob/master/CMake/pv-forward.c.in#L113

--ben