glx: unify GLX_SGIX_pbuffer aliased declarations
No point in having an identical code in two places. Not to mention that the Apple one incorrectly uses GLXDrawable as pbuf type. This change is both API and ABI safe since the header uses the correct GLXPbufferSGIX and both types are a typedef of the same primitive XID. Cc: Jeremy Huddleston Sequoia <jeremyhu@apple.com> Signed-off-by:Emil Velikov <emil.velikov@collabora.com> Reviewed-by:
Jeremy Sequoia <jeremyhu@apple.com>