i965: Compute VS/GS output VUE map from the NIR info.

unify_interfaces() only updates the NIR program info, not the copy
in the gl_program itself.  So, by using the old copy, we were missing
out on these updates.

The TCS/TES ones already did this correctly.

Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com>

src/mesa/drivers/dri/i965/brw_gs.c

    brw_nir_analyze_ubo_ranges(compiler, gp->program.nir,
                               prog_data.base.base.ubo_ranges);
 
-   uint64_t outputs_written = gp->program.info.outputs_written;
+   uint64_t outputs_written = gp->program.nir->info.outputs_written;
 
    brw_compute_vue_map(devinfo,
                        &prog_data.base.vue_map, outputs_written,

src/mesa/drivers/dri/i965/brw_vs.c

    }
 
    uint64_t outputs_written =
-      brw_vs_outputs_written(brw, key, vp->program.info.outputs_written);
+      brw_vs_outputs_written(brw, key, vp->program.nir->info.outputs_written);
 
    brw_compute_vue_map(devinfo,
                        &prog_data.base.vue_map, outputs_written,