Use defs.h (and automatically setup.h and chkconf.h) before first wxUSE_* check (bug #1164141).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/imagpng.h

@@ -14,7 +14,7 @@
 #pragma interface "imagpng.h"
 #endif
 
-#include "wx/image.h"
+#include "wx/defs.h"
 
 //-----------------------------------------------------------------------------
 // wxPNGHandler
@@ -22,6 +22,8 @@
 
 #if wxUSE_LIBPNG
 
+#include "wx/image.h"
+
 #define wxIMAGE_OPTION_PNG_FORMAT    wxT("PngFormat")
 #define wxIMAGE_OPTION_PNG_BITDEPTH  wxT("PngBitDepth")
 
@@ -52,8 +54,9 @@ public:
 private:
     DECLARE_DYNAMIC_CLASS(wxPNGHandler)
 };
-#endif
 
+#endif
+  // wxUSE_LIBPNG
 
 #endif
   // _WX_IMAGPNG_H_