configure and #ifdef wxUSE_XXX updates

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1315 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/zstream.h

@@ -15,6 +15,10 @@
 #pragma interface
 #endif
 
+#include "defs.h"
+
+#ifdef wxUSE_ZLIB
+
 #include <wx/stream.h>
 
 class WXDLLEXPORT wxZlibInputStream: public wxFilterInputStream {
@@ -48,3 +52,5 @@ class WXDLLEXPORT wxZlibOutputStream: public wxFilterOutputStream {
 };
 
 #endif
+
+#endif