Added dummy GetTextWidget() implementation for wxMotif wxComboCtrl

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66438 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/combo.h

@@ -83,6 +83,8 @@ protected:
     // Dummies for platform-specific wxTextEntry implementations
 #if defined(__WXUNIVERSAL__)
     // Looks like there's nothing we need to override here
+#elif defined(__WXMOTIF__)
+    virtual WXWidget GetTextWidget() const { return NULL; }
 #elif defined(__WXGTK__)
 #if defined(__WXGTK20__)
     virtual GtkEditable *GetEditable() const { return NULL; }