Move Linux versions of NVidia graphics libraries (OpenGL/GLX/EGL/GLES/GLVND)
to its own ports instead of abusing the driver ports and making maintenance
thereof a nightmare. This is also what most, if not all, GNU/Linux distros
do, allows to properly annotate ports with correct CATETORIES, USES, macros
like NO_BUILD etc., and greatly simplify Makefiles and distinfo files.