Add wxNOEXCEPT and use it for std::streambuf-derived classes.

This fixes warnings from Intel compiler about overriding function using a
different exception specification than the base one and also incidentally
provides a handy macro that can be useful in other situations.

Closes #14826.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72978 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/combocmn.cpp

@@ -940,7 +940,7 @@ class wxComboCtrlTextCtrl : public wxTextCtrl
 {
 public:
     wxComboCtrlTextCtrl() : wxTextCtrl() { }
-    virtual ~wxComboCtrlTextCtrl() { }
+    virtual ~wxComboCtrlTextCtrl() wxNOEXCEPT { }
 
     virtual wxWindow *GetMainWindowOfCompositeControl()
     {