Added a few #if wxUSE_XXX

Regrouped image format handlers
  Updated the rest accordingly
  Added changes.txt for wxGTK


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2795 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/prntdlgg.h

@@ -18,6 +18,9 @@
 #endif
 
 #include "wx/defs.h"
+
+#if wxUSE_PRINTING_ARCHITECTURE
+
 #include "wx/dialog.h"
 #include "wx/dialog.h"
 
@@ -187,5 +190,7 @@ private:
     DECLARE_EVENT_TABLE()
 };
 
+#endif
+
 #endif
 // __PRINTDLGH_G__