gallium: added cso_delete_vertex_fragment_shader() functions
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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