fix MMCE on arcade hardware

Author: israpps

Makefile

@@ -110,8 +110,10 @@ ifeq ($(MMCE),1)
     EE_OBJS += mmceman_irx.o
     EE_CFLAGS += -DMMCE
     HAS_MMCE = -MMCE
+ifeq ($(COH),0)#arcade rom0:SIO2MAN == retail rom0:XSIO2MAN
     SIO2MAN = 1
 endif
+endif
 
 ifeq ($(MX4SIO),1)
   ifneq ($(EXFAT),1)