Replace wxOVERRIDE and wxNOEXCEPT with override and noexcept

Don't use deprecated macros in wxWidgets itself.

tests/net/socket.cpp

@@ -257,7 +257,7 @@ void SocketTestCase::ReadAnotherThread()
         {
         }
 
-        virtual void* Entry() wxOVERRIDE
+        virtual void* Entry() override
         {
             wxSocketClientPtr sock(SocketTestCase::GetHTTPSocket(wxSOCKET_BLOCK));
             if ( !sock )

tests/net/webrequest.cpp

@@ -116,7 +116,7 @@ public:
         }
     }
 
-    void Notify() wxOVERRIDE
+    void Notify() override
     {
         WARN("Exiting loop on timeout");
         loop.Exit();