vo_opengl: clean up GL ES function loading

Previously, this was sort of messed together with desktop OpenGL
loading. Add explicit support for ES, and clean up the mess. Also sort
the function arrays alphabetically (at least most of them).

In some cases, add functions to multiple sections. This keeps the number
of sections down.

Don't check for GL_ARB_vertex_array_object. This feature must be used in
OpenGL 3 core, while it may be not available at all in earlier versions,
and not using it if it's available as extension only has no advantages.

This commit also considers GLES 2, because actual support for it will be
added with a later commit.

Also get rid of some MPGL_VER() uses (see some commits ago).

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