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Set `VTK_LEGACY_REMOVE` rather than `VTK_LEGACY_SILENT`. No point in
compiling legacy code in releases.

adds an option plus the supporting openvr lib
along with some required patches for their CMake
files.

VTK-m and ParaView cannot depend on `cxx11` because it adds `-std=c++11`
which confuses the CUDA compiler. Copy the stdlib choice from `cxx11` to
these projects.

The CXX11 project injects additional flags ('std=c++11') into the CXX compile
line. This is unnecessary as both projects already require C++11. Secondly
this breaks the CUDA compilation of VTK-m filters as now CUDA has two
occurrences of C++11 on the compile line and errors out.

Only Qt5 is supported anymore.

ParaView now only supports the newer, OpenGL2 backend.

It is no longer required.

The VTK module system does not use imported targets well, so force CMake
to not bring them in.

ParaView now has its own internal version.

Already merged into master, but not in 5.3.0

Fixes #41.

Fixes #39.

Also removes patch from git builds since the issues are being resolved
upstream and now only apply to the release.

Note: Once this is fixed upstream then we can make the patch conditional
on the release source selection

This is needed for certain components in ParaView (VisitBridge GMV
reader), when mesa is enabled.

see vtk/vtk!1969

Bettern than relying on the working directory of the script.

Not necessary, but it's nice to have.

It is no longer necessary.

This allows a catalyst package to be made.