don't include wx/wxprec.h from headers, it's bad style (patch from Tim Stahlhut)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47932 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

demos/life/dialogs.h

@@ -12,18 +12,6 @@
 #ifndef _LIFE_DIALOGS_H_
 #define _LIFE_DIALOGS_H_
 
-// for compilers that support precompilation, includes "wx/wx.h"
-#include "wx/wxprec.h"
-
-#ifdef __BORLANDC__
-    #pragma hdrstop
-#endif
-
-// for all others, include the necessary headers
-#ifndef WX_PRECOMP
-    #include "wx/wx.h"
-#endif
-
 #include "life.h"
 #include "game.h"