Include wx/checklst.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39463 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/checklst.cpp

@@ -21,11 +21,13 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #if wxUSE_CHECKLISTBOX && wxUSE_OWNER_DRAWN
 
+#include "wx/checklst.h"
+
 #ifndef WX_PRECOMP
     #include "wx/object.h"
     #include "wx/colour.h"
@@ -41,7 +43,6 @@
 #endif
 
 #include "wx/ownerdrw.h"
-#include "wx/checklst.h"
 
 #include "wx/msw/wrapwin.h"
 #include <windowsx.h>