fix arguments to build with libwebsockets:0/20
https://bugs.gentoo.org/962581
PR pending for driftnet-1.5.0 uses another schema
https://github.com/deiv/driftnet/pull/57.patch
--- a/src/http_display/httpd.c
+++ b/src/http_display/httpd.c
@@ -188,10 +188,22 @@ static void * http_server_dispatch(void *arg)
         0,
         0,
         0,
-        LWSMPRO_FILE,	                /* mount type is a directory in a filesystem */
+#if LWS_LIBRARY_VERSION_MAJOR >= 4 && LWS_LIBRARY_VERSION_MINOR > 3
+        0,				/* check cache always */
+#endif
+	LWSMPRO_FILE,			/* mount type is a directory in a filesystem */
         1,		                        /* strlen("/"), ie length of the mountpoint */
         NULL,
-        { NULL, NULL } // sentinel
+#if LWS_LIBRARY_VERSION_MAJOR >= 4 && LWS_LIBRARY_VERSION_MINOR > 3
+        NULL,				/* chroot_path */
+        NULL,				/* working directory, default /tmp */
+        NULL,				/* override the headers */
+        0,				/* keepalive_timeout */
+#endif
+#if LWS_LIBRARY_VERSION_MAJOR <= 4 && LWS_LIBRARY_VERSION_MINOR < 3
+        NULL,				/* sentinel */
+        NULL,				/* sentinel */
+#endif
     };
 
     memset(&info, 0, sizeof info);