non-working coin insert emulation

mercuryhook/io4.c

@@ -61,6 +61,10 @@ static HRESULT mercury_io4_poll(void *ctx, struct io4_state *state)
 
     if (opbtn & MERCURY_IO_OPBTN_SERVICE) {
         state->buttons[0] |= IO4_BUTTON_SERVICE;
+    }    
+
+    if (gamebtn & MERCURY_IO_OPBTN_COIN) {
+        state->chutes[0] |= 1 << 1; // FIXME: insert coins
     }
 
     if (gamebtn & MERCURY_IO_GAMEBTN_VOL_UP) {