Allow using noexcept methods with event tables macros

Explicitly remove noexcept before static-casting the member function
pointer to the base class pointer type to avoid compilation error with
C++17.

Add a test checking that this does work now.

Closes #18721.

tests/events/evthandler.cpp

@@ -122,6 +122,9 @@ public:
     void OnEvent(wxEvent&) { g_called.method = true; }
     void OnAnotherEvent(AnotherEvent&);
     void OnIdle(wxIdleEvent&) { g_called.method = true; }
+#ifdef wxHAS_NOEXCEPT
+    void OnIdleNoExcept(wxIdleEvent&) noexcept { }
+#endif
 
 private:
     wxDECLARE_EVENT_TABLE();
@@ -138,6 +141,10 @@ wxBEGIN_EVENT_TABLE(MyClassWithEventTable, wxEvtHandler)
     EVT_MYEVENT(MyClassWithEventTable::OnMyEvent)
     EVT_MYEVENT(MyClassWithEventTable::OnEvent)
 
+#ifdef wxHAS_NOEXCEPT
+    EVT_IDLE(MyClassWithEventTable::OnIdleNoExcept)
+#endif
+
     // this shouldn't compile:
     //EVT_MYEVENT(MyClassWithEventTable::OnIdle)
     //EVT_IDLE(MyClassWithEventTable::OnAnotherEvent)