i965: Stop making a copy of non-builtin uniforms in ParameterValues[].
i965: Stop making a copy of non-builtin uniforms in ParameterValues[].

We don't need them now that our set of parameter pointers points at the
GL core storage for them.  This should save memory/bandwidth/overhead in
uniform updates.

Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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