Deprecated demos, ie using a deprecated - non std GL API.
Solution might be:
    (1) Remove, with a reference of a similar demo using the std API
    (2) Rewrite using the std API

And here the infamous candidates, demos using:

    (1) GL_VERTEX_ARRAY_RANGE_NV -> Any VBO demo (FIXME)
    (2) glGenFencesNV -> GL3/GL4
    (?) GL_ALL_COMPLETED_NV
    (?) glAllocateMemoryNV -> might be removed . of GLContext ?