i965: Silence unused parameter warnings

i965: Silence unused parameter warnings

The only place that actually used the type parameter was the GS visitor,
and it was always passed glsl_type::int.  Just remove the parameter.

brw_vec4_vs_visitor.cpp:38:61: warning: unused parameter ‘type’ [-Wunused-parameter]
                                            const glsl_type *type)
                                                             ^

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>