samsung: fix mkorigenspl for darwin

Compiling the mkorigenspl tool on darwin complains about undefined ulong. Fix
this by using the unified way.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

board/samsung/origen/tools/mkorigenspl.c

@@ -83,8 +83,8 @@ int main(int argc, char **argv)
 	for (i = 0; i < IMG_SIZE - SPL_HEADER_SIZE; i++)
 		checksum += buffer[i+16];
 
-	*(ulong *)buffer ^= 0x1f;
-	*(ulong *)(buffer+4) ^= checksum;
+	*(unsigned long *)buffer ^= 0x1f;
+	*(unsigned long *)(buffer+4) ^= checksum;
 
 	for (i = 1; i < SPL_HEADER_SIZE; i++)
 		buffer[i] ^= buffer[i-1];