Add support for emulated Game Genie add-on

src/video.c

@@ -86,16 +86,19 @@ void FCEU_PutImageDummy(void)
 {
 }
 
-void FCEU_DispMessage(char *format, ...)
+void FCEU_DispMessage(enum retro_log_level level, unsigned duration, char *format, ...)
 {
+   static char msg[512] = {0};
    va_list ap;
-   static char errmsg[65];
+
+   if (!format || (*format == '\0'))
+      return;
 
    va_start(ap, format);
-   vsprintf(errmsg, format, ap);
+   vsprintf(msg, format, ap);
    va_end(ap);
 
-   FCEUD_DispMessage(errmsg);
+   FCEUD_DispMessage(level, duration, msg);
 }
 
 void FCEU_ResetMessages(void)