gpgx - support up to 32MB roms (fix #543 probably)

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs

@@ -70,8 +70,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			// http://www.sega-16.com/forum/showthread.php?4398-Forgotten-Worlds-giving-you-GAME-OVER-immediately-Fix-inside&highlight=forgotten%20worlds
 
 			//hack, don't use
-			//romfile = File.ReadAllBytes(@"D:\encodes\bizhawksrc\output\SANIC CD\PierSolar (E).bin");
-			if (rom != null && rom.Length > 16 * 1024 * 1024)
+			if (rom != null && rom.Length > 32 * 1024 * 1024)
 			{
 				throw new InvalidOperationException("ROM too big!  Did you try to load a CD as a ROM?");
 			}

genplus-gx/core/loadrom.h

@@ -40,7 +40,7 @@
 #ifndef _LOADROM_H_
 #define _LOADROM_H_
 
-#define MAXROMSIZE 10485760
+#define MAXROMSIZE (32*1024*1024)
 
 typedef struct
 {