fix a couple of harmless warnings during wxOSX build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61124 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/evtloopunix.cpp

@@ -200,7 +200,8 @@ bool wxConsoleEventLoop::Pending() const
 
 bool wxConsoleEventLoop::Dispatch()
 {
-    DispatchTimeout(wxFDIODispatcher::TIMEOUT_INFINITE);
+    DispatchTimeout(static_cast<unsigned long>(
+        wxFDIODispatcher::TIMEOUT_INFINITE));
 
     return true;
 }