**_Dreadfully dull Halloween-oriented indie from the late ’80s_** There are some dirt-cheap horror indies from the 1980s that are entertaining and worth one’s time for one reason or another, such as “The Majorettes,” “Blood Harvest,” “Blood Hook” and “Luther the Geek,” but “Hollowgate” (or “Hollow Gate”) isn’t one of ’em. The story revolves around two couples in their late teens ending up at an unknown rural estate on Halloween night where they’re hunted by a man who forgot to take his meds. It’s a decent plot which could deliver the goods but drops the ball. I can roll with the low-rent…