Avoid g++ 3.4.5 warning about wxMSWOwnerDrawnButtonBase dtor.

Fixing the warning for recent g++ versions introduced it for the old one, so
work around this inside our workaround.

See #17005.

include/wx/msw/ownerdrawnbutton.h

@@ -37,7 +37,14 @@ protected:
     // has virtual functions, but no virtual destructor without making the dtor
     // virtual which is not needed here as objects are never deleted via
     // pointers to this class (and protected dtor enforces this).
+    //
+    // Unfortunately g++ 3.4.5 still complains about the dtor being non virtual
+    // even if it is protected, but actually does not give any warnings if the
+    // dtor is not defined at all, so work around this 3.4.5 bug inside our
+    // general g++ workaround.
+#if wxCHECK_GCC_VERSION(4, 0)
     ~wxMSWOwnerDrawnButtonBase() { }
+#endif // g++ 4.0+
 
     // Make the control owner drawn if necessary to implement support for the
     // given foreground colour.