moving appdelegate declaration to header

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67083 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/cocoa/private.h

@@ -348,6 +348,11 @@ protected :
     - (void)sheetDidEnd:(NSWindow *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo;
     @end
 
+    @interface wxNSAppController : NSObject wxOSX_10_6_AND_LATER(<NSApplicationDelegate>)
+    {
+    }
+
+    @end
 
 #endif // __OBJC__