mesa: Add a comment explaining my thoughts on glBindBufferBase().
mesa: Add a comment explaining my thoughts on glBindBufferBase().

Reviewed-by: Brian Paul <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@vmware.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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