Cleanup: removed unused Blender Internal bump/normal mapping texture code

The TexResult.nor output does not appear to be used anywhere.

source/blender/modifiers/intern/MOD_displace.c

@@ -197,7 +197,6 @@ static void displaceModifier_do_task(void *__restrict userdata,
   }
 
   if (data->tex_target) {
-    texres.nor = NULL;
     BKE_texture_get_value_ex(
         data->scene, data->tex_target, tex_co[iter], &texres, data->pool, false);
     delta = texres.tin - dmd->midlevel;