Quoted from PinMonk:Lethal Weapon 3 - Mel was IN it and Schwartzenegger has played one
Last Action Hero - Arnold only. Doubt it's this.
Maverick - Mel Gibson was IN it, and Schwartzenegger could be considered one.
Oh, derp. I guess those two guys cover the three DataEast games left. Turns out it's no help at all.