Corrected link error for missing wxRegTipProvider::GetTip by giving it

an empty stub function that can be filled in later when somebody
finishes this class.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2936 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/tipdlg.cpp

@@ -79,6 +79,13 @@ public:
 
     virtual wxString GetTip();
 };
+
+// Empty implementation for now to keep the linker happy
+wxString wxRegTipProvider::GetTip()
+{
+    return "";
+}
+
 #endif // __WIN32__
 
 // the dialog we show in wxShowTip()