Move turbo button to retropad X in Super Hang-On (make it easy to accelerate and use turbo together).

Author: sergiobenrocha2

src/osd/retro/retromain.c

@@ -1324,6 +1324,20 @@ static void Input_Binding(running_machine &machine)
       Buttons_mapping[5]=RETROPAD_R;
 
    }
+   else if (
+              (core_stricmp(machine.system().name, "shangon") == 0) ||
+              (core_stricmp(machine.system().parent, "shangon") == 0)
+           )
+   {
+      /* Super Hang-On */
+
+      Buttons_mapping[0]=RETROPAD_A;
+      Buttons_mapping[1]=RETROPAD_B;
+      Buttons_mapping[2]=RETROPAD_Y;
+      Buttons_mapping[3]=RETROPAD_X;
+      Buttons_mapping[4]=RETROPAD_L;
+      Buttons_mapping[5]=RETROPAD_R;
+   }
 
 }