Added joystick emulation

src/plat-joystick.h

@@ -0,0 +1,19 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+        void joystick_init();
+        void joystick_close();
+        void poll_joystick();
+        
+        typedef struct joystick_t
+        {
+                int x, y;
+                int b[4];
+        } joystick_t;
+        
+        extern joystick_t joystick_state[2];
+        extern int joysticks_present;
+#ifdef __cplusplus
+}
+#endif
+