vbo: Redeclare bind_array() as non-static vbo_bind_array()

This is necessary because i965 will need to call vbo_bind_array() when
cleaning up after a buffer resolve meta-op.

Detailed Explanation
--------------------
The vbo module tracks vertex attributes separately from the gl_context.
Specifically, the vbo module maintins vertex attributes in
vbo_exec_context::array::inputs, which is synchronized with
gl_context::Array::ArrayObj::VertexAttrib by vbo_bind_array().
vbo_draw_arrays() calls vbo_bind_array() to perform the synchronization
before calling the real draw call, vbo_context::draw_arrays.

Intel hardware accomplishes buffer resolves with a meta-op. Frequently,
that meta-op must be performed within glDraw* in the moment immediately
before the draw occurs (The hardware designers hate us...). After
performing the meta-op, but before calling vbo_bind_array(), the
gl_context's vertex attributes will have been restored to their original
state (that is, their state before the meta-op began), but the vbo
module's vertex attribute are those used in the last meta-op. Therefore we
must manually synchronize the two with vbo_bind_array() before continuing
with the original draw command (that is, the one requested with glDraw*).

See brw_predraw_resolve_buffers(), which will be added in a future commit.

Reviewed-by: Brian Paul <[email protected]>
Signed-off-by: Chad Versace <[email protected]>

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