Improve OSMesa configurations
Add the VTKm_ENABLE_OSMESA CMake option and correct the configuration for when conflicting OSMesa and OpenGL libraries could exist.
System updates will be applied on Nov 25th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.
Add the VTKm_ENABLE_OSMESA CMake option and correct the configuration for when conflicting OSMesa and OpenGL libraries could exist.