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The state tracker now uses these functions to free shaders, rather than
the pipe->delete_vs/fs-state() functions. Before, we could get in a situation
where we free() a shader and happen to alloc() a new one at the same address.
The cso_set_vertex/fragment_shader() function would no-op the state change
since the pointers were the same. This led to problems elsewhere, of course.
The new delete functions null-out the CSO's current shader pointers.
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(blit, gen-mipmaps, quad-clear, etc)
Also, additional cso_set_*() functions for viewport, framebuffer, blend color,
etc. state.
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If we go behind the CSO context's back and set pipe state directly we
need to invalidate the CSO's 'current' pointers.
This will be revisited...
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given state
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