BMC-8157: ignore prg mapping for split rom types

- fixes 1 of only 2 CK-001 4-in-1 carts i found so far

src/boards/8157.c

@@ -36,10 +36,13 @@ static void Sync(void) {
 	uint32 base = ((cmdreg & 0x060) | ((cmdreg & 0x100) >> 1)) >> 2;
 	uint32 bank = (cmdreg & 0x01C) >> 2;
 	uint32 lbank = (cmdreg & 0x200) ? 7 : ((cmdreg & 0x80) ? bank : 0);
-	if (PRGptr[1]) {
-		setprg16r(base >> 3, 0x8000, bank);        /* for versions with split ROMs */
+	/* this fails to load at least one game, which probably has invalid PRG size in header
+	 * (rom is only 512KB but reported as having 3 prg banks with 128k each) */
+	/*if (PRGptr[1]) {
+		setprg16r(base >> 3, 0x8000, bank);        // for versions with split ROMs
 		setprg16r(base >> 3, 0xC000, lbank);
-	} else {
+	} else*/
+	{
 		setprg16(0x8000, base | bank);
 		setprg16(0xC000, base | lbank);
 	}

src/boards/KS7032.c

@@ -2,7 +2,7 @@
  *
  * Copyright notice for this file:
  *  Copyright (C) 2007 CaH4e3
- *  Copyright (C) 2019 Libretro Team (IRQ Update)
+ *  Copyright (C) 2019 Libretro Team
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by