Refactors __glXImageSize and __glXImage3DSize into a single function. It

    replaces all calls to the old functions with calls to __glXImageSize
    with the new parameter list.
I have also added 'target' as a parameter. This is a stepping stone to the
    code in patch #2410. Basically, if the texture target is one of
    GL_PROXY_*, the image size is always zero. This gathers all the checks
    for that into a single place. I have *not* modified the existing
    callers to take this into account. They still do their own checks for
    GL_PROXY_*. However, when the generated versions of those functions are
    added to the tree, they *will* rely on that.
The code growth is mainly due to the new 40 line comment before
    __glXImageSize.
I have tested this with a few of the texture using demos and tests from
    Mesa, including tunnel, texdown, and drawpix.
Reviewed by: Adam Jackson, Eric Anholt, and Brian Paul.

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