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This allows us to remove most of the direct references to winsys in the state tracker.
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Provide an actual definition of the pipe_buffer struct, containing
the parameters used to create the buffer, and its refcount.
Shift refcounting buffers out of the winsys interface, similar to
surfaces & textures.
Rework pipebuffer/ to reflect the fact these changes, and also Michel's
reworking of the buffer interface.
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The properties of a buffer represented by struct pipe_buffer_handle are now
basically constant over its lifetime. The state tracker gets to deal with any
more complex buffer semantics it may need to provide.
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Winsys driver needs some hints in order to allocate the appropriate kind of
memory for the buffer.
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We need to do these initializations before initializing the Mesa context
because context init involves creating texture/program/etc objects.
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The state_tracker driver needs these to implement, eg. pixel buffer objects,
vertex buffer objects.
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