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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39627 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/layout.cpp

@@ -26,6 +26,8 @@
 
 #if wxUSE_CONSTRAINTS
 
+#include "wx/layout.h"
+
 #ifndef WX_PRECOMP
     #include "wx/window.h"
     #include "wx/utils.h"
@@ -34,8 +36,6 @@
     #include "wx/intl.h"
 #endif
 
-#include "wx/layout.h"
-
 
 IMPLEMENT_DYNAMIC_CLASS(wxIndividualLayoutConstraint, wxObject)
 IMPLEMENT_DYNAMIC_CLASS(wxLayoutConstraints, wxObject)