I have a soft spot for 1979's The Black Hole and, in particular, John Barry's beautiful score for it. It appears that this film, plus Star Trek: The Motion Picture (in the same year) were the last films to feature a short overture at the beginning - were there any other films after these two that featured overtures?
I believe Midnight in Paris (2011) had an overture, if I remember correctly.
Wikipedia has a nice list of films containing overtures, including a post-1970 section. I can't imagine that it's completely exhaustive, so I'm sure that there are films with overtures missing from the list. But the short answer to your question is no - The Black Hole was not the last film to feature an overture.