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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39054 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/renderg.cpp

@@ -24,18 +24,19 @@
     #pragma hdrstop
 #endif
 
+#include "wx/renderer.h"
+
 #ifndef WX_PRECOMP
     #include "wx/string.h"
+    #include "wx/dc.h"
 #endif //WX_PRECOMP
 
 #include "wx/gdicmn.h"
-#include "wx/dc.h"
 
 #include "wx/settings.h"
 #include "wx/splitter.h"
 #include "wx/dcmirror.h"
 #include "wx/module.h"
-#include "wx/renderer.h"
 
 // ----------------------------------------------------------------------------
 // wxRendererGeneric: our wxRendererNative implementation