Fixes so joystick not only compiles on Linux, but it actually works too!

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27265 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/joytest/joytest.h

@@ -16,6 +16,8 @@ public:
     bool OnInit();
 
     // Joystick max values
+    int     m_minX;
+    int     m_minY;
     int     m_maxX;
     int     m_maxY;
 
@@ -33,6 +35,7 @@ public:
     ~MyCanvas();
     void OnJoystickEvent(wxJoystickEvent& event);
 
+    wxJoystick* m_stick;
     DECLARE_EVENT_TABLE()
 };