vo_opengl: some minor cleanups

default_tex_params() and texture_size() are each called only once, so
move inline/reimplement them at the caller.

image_dw/dh were unused. texture_w/h, image_format, and component_bits
were rarely used, and can be replaced. Regroup some other fields.

Rename surface_num to surface_idx, because the former sounded like a
count, and not an index. Move fbosurface_next() closer to its callers
too.

Move the DebugMessageCallback() code to gl_utils.c (also simplify it
by always setting the callback, instead of only when it changes).

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