Another "if it ain't broke, don't fix it" moment.  Revert some more code in _glapi_set_dispatch to its 1.74 form.  This fixes a "problem" with buggy apps that make GL calls with no bound GL context (i.e., Enemy Territory during shut-down).
Another "if it ain't broke, don't fix it" moment.  Revert some more
code in _glapi_set_dispatch to its 1.74 form.  This fixes a "problem"
with buggy apps that make GL calls with no bound GL context (i.e.,
Enemy Territory during shut-down).

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