wxThread::Sleep() is the same as wxMilliSleep() on all platforms but Mac (and maybe it should be the same thing there as well)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53134 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/thread.cpp

@@ -916,11 +916,6 @@ void wxThread::Yield()
     ::Sleep(0);
 }
 
-void wxThread::Sleep(unsigned long milliseconds)
-{
-    ::Sleep(milliseconds);
-}
-
 int wxThread::GetCPUCount()
 {
     SYSTEM_INFO si;