Compilation fixes

Found out how to do wxUSE_XX 0 and 1


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1324 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/thread.h

@@ -106,6 +106,8 @@ private:
     wxMutex *m_mutex;
 };
 
+#ifdef __WXMSW__
+
 // ----------------------------------------------------------------------------
 // Critical section: this is the same as mutex but is only visible to the
 // threads of the same process. For the platforms which don't have native
@@ -146,6 +148,8 @@ private:
     wxCriticalSection *m_critsect;
 };
 
+#endif
+
 // ----------------------------------------------------------------------------
 // Condition handler.
 // ----------------------------------------------------------------------------