Omar Padron
573489db71
Add libglvnd packages/Add EGL support (#14572)
* add new package: "libglvnd-frontend"
* add +glvnd variant to opengl package
* add +glvnd variant to mesa package
* add +egl variant to paraview package
* add libglvnd-frontend entries to default packages config
* fix style
* add default providers for glvnd virtuals
add default providers for glvnd-gl, glvnd-glx, and glvnd-egl
* WIP: rough start to external OpenGL documentation
* rename libglvnd-frontend package and backend virtual dependencies
* update documentation
* fix ligvnd-be-* typos
* fix libglvnd-fe package class name
* fix doc parse error