Can someone working with SICStus check if this patch breaks debugger(or anything) when `run-prolog` is used?

I have repeatedly checked switching between GNU-Prolog and SWI-Prolog systems after setting `prolog-system` to buffer local values 'gnu' and 'swi' resp.
Both `prolog-consult-file` and `run-prolog` are now starting the correct interpreter.