add const qualifiers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52414 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/splash.h

@@ -65,17 +65,17 @@ public:
         Returns the splash style (see wxSplashScreen() for
         details).
     */
-    long GetSplashStyle();
+    long GetSplashStyle() const;
 
     /**
         Returns the window used to display the bitmap.
     */
-    wxSplashScreenWindow* GetSplashWindow();
+    wxSplashScreenWindow* GetSplashWindow() const;
 
     /**
         Returns the timeout in milliseconds.
     */
-    int GetTimeout();
+    int GetTimeout() const;
 
     /**
         Reimplement this event handler if you want to set an application variable on