* glew: rework dependency on gl
This simplifies the package and ensures a single gl implementation is
pulled in. Before we were adding direct dependencies, and those are
not unified through the virtual.
* mesa-demos: rework dependency on gl
This simplifies the package and ensures a single gl implementation is
pulled in. Before we were adding direct dependencies, and those are
not unified through the virtual.
* mesa-glu: rework dependency on gl
This simplifies the package and ensures a single gl implementation is
pulled in. Before we were adding direct dependencies, and those are
not unified through the virtual.
* paraview: fix dependency on glew
* mesa: group dependency on when("+glx")
* Add missing dependency on libxml2
* paraview: remove the "osmesa" and "egl" variant
Instead, enforce consistency using the "gl" virtual that allows
only one provider.
* visit: remove osmesa variant
* Disable paraview in the aws-isc stacks
* data-vis-sdk: rework constrains to enforce front-ends
* e4s-power: remove redundant paraview
* Pipelines: update osmesa variants
* trilinos-catalyst-ioss-adapter: make gl a run dependency
8b7abace8b