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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38885 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/notebook.cpp

@@ -21,16 +21,18 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
-#ifndef __WXPALMOS__
+#include  "wx/notebook.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+#endif
 
-#include  "wx/string.h"
 #include  "wx/log.h"
 #include  "wx/settings.h"
 #include  "wx/generic/imaglist.h"
-#include  "wx/notebook.h"
 #include  "wx/dcclient.h"
 #include  "wx/generic/tabg.h"
 
@@ -711,5 +713,3 @@ bool wxNotebookTabView::OnTabPreActivate(int activateId, int deactivateId)
   }
   return retval;
 }
-
-#endif // __WXPALMOS__