made definition of wxUSE_LOG_DEBUG dependent on wxDEBUG_LEVEL and added wxUSE_LOG_TRACE (currently never enabled by default); fix warnings about unused variables after these changes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59736 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/threadpsx.cpp

@@ -720,7 +720,7 @@ public:
     wxThreadState GetState() const { return m_state; }
     void SetState(wxThreadState state)
     {
-#ifdef __WXDEBUG__
+#if wxUSE_LOG_TRACE
         static const wxChar *stateNames[] =
         {
             _T("NEW"),
@@ -731,7 +731,7 @@ public:
 
         wxLogTrace(TRACE_THREADS, _T("Thread %p: %s => %s."),
                    GetId(), stateNames[m_state], stateNames[state]);
-#endif // __WXDEBUG__
+#endif // wxUSE_LOG_TRACE
 
         m_state = state;
     }