implement out-of-line destructors where needed instead of using __DARWIN__

specific conditional compilation


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13447 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/toplvcmn.cpp

@@ -60,6 +60,11 @@ wxTopLevelWindowBase::wxTopLevelWindowBase()
 {
 }
 
+wxTopLevelWindowBase::~wxTopLevelWindowBase()
+{
+    // this destructor is required for Darwin
+}
+
 bool wxTopLevelWindowBase::Destroy()
 {
     // delayed destruction: the frame will be deleted during the next idle