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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38945 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/toolbar.cpp

@@ -24,10 +24,14 @@
 #define XtDisplay XTDISPLAY
 #endif
 
-#include "wx/settings.h"
-#include "wx/app.h"
-#include "wx/timer.h"
 #include "wx/toolbar.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/app.h"
+#endif
+
+#include "wx/settings.h"
+#include "wx/timer.h"
 #include "wx/frame.h"
 
 #ifdef __VMS__
@@ -786,4 +790,3 @@ void wxToolBarTimer::Notify()
         /************************************************************/
         XtPopup (help_popup, XtGrabNone);
 }
-