Allowed HTTPS to be a separately configurable feature.

src/include/gpxe/http.h

@@ -13,4 +13,9 @@
 /** HTTPS default port */
 #define HTTPS_PORT 443
 
+extern int http_open_filter ( struct xfer_interface *xfer, struct uri *uri,
+			      unsigned int default_port,
+			      int ( * filter ) ( struct xfer_interface *,
+						 struct xfer_interface ** ) );
+
 #endif /* _GPXE_HTTP_H */