galaxian/galaxian.cpp: hook up Galaxian discrete sound for 'bongoa', rename set to indicate the different hardware #12360
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This is a followup to #12314, using this video as a reference. (I haven't attempted to figure out which color PROM the board in that video is using, though)
I was inclined to mark this set as a bootleg since the ROM differences are very clearly hacks on top of the parent set, but I'll wait for a second opinion on that.