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/frame.cpp

@@ -30,6 +30,7 @@
 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
+    #include "wx/app.h"
 #endif
 
 #include "wx/statusbr.h"
@@ -37,7 +38,6 @@
 #include "wx/menu.h"
 #include "wx/settings.h"
 #include "wx/utils.h"
-#include "wx/app.h"
 #include "wx/icon.h"
 
 #ifdef __VMS__