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/timercmn.cpp

@@ -110,6 +110,11 @@
 
 #if wxUSE_GUI && wxUSE_TIMER
 
+wxTimerBase::~wxTimerBase()
+{
+    // this destructor is required for Darwin
+}
+
 void wxTimerBase::Notify()
 {
     // the base class version generates an event if it has owner - which it