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/sckstrm.h

@@ -16,6 +16,9 @@
 #endif
 
 #include "wx/stream.h"
+
+#if wxUSE_SOCKETS && wxUSE_STREAMS
+
 #include "wx/socket.h"
 
 class WXDLLEXPORT wxSocketOutputStream : public wxOutputStream
@@ -63,3 +66,7 @@ class WXDLLEXPORT wxSocketStream : public wxSocketInputStream,
 };
 
 #endif
+  // wxUSE_SOCKETS && wxUSE_STREAMS
+
+#endif
+  // __SCK_STREAM_H__