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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39310 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/dcmemory.cpp

@@ -16,10 +16,9 @@
 
 #ifndef WX_PRECOMP
     #include "wx/utils.h"
+    #include "wx/settings.h"
 #endif
 
-#include "wx/settings.h"
-
 #ifdef __VMS__
 #pragma message disable nosimpint
 #endif
@@ -139,5 +138,3 @@ void wxMemoryDC::DoGetSize( int *width, int *height ) const
         if (height) (*height) = 0;
     };
 }
-
-