Fix compilation of wxFileSystemWatcher unit test in non-PCH build.

Add #include of wx/timer.h needed when not using PCH.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67695 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/fswatcher/fswatchertest.cpp

@@ -17,6 +17,10 @@
     #pragma hdrstop
 #endif
 
+#ifndef WX_PRECOMP
+    #include "wx/timer.h"
+#endif
+
 #include "wx/evtloop.h"
 #include "wx/filename.h"
 #include "wx/filefn.h"