servo: Merge #19083 - Fix new failure in Nightly 2017-11-01 (from servo:vis); r=SimonSapin

The rustc::declare_lints! macro started using a :vis fragment specifier.

Source-Repo: https://github.com/servo/servo
Source-Revision: b23131abf1528ab47602881fe5dbcbdc16f2b76a

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 66b74073dc3112c2fc3b7357144a60743cdf658a

servo/components/script_plugins/lib.rs

@@ -15,6 +15,7 @@
 
 
 #![deny(unsafe_code)]
+#![feature(macro_vis_matcher)]
 #![feature(plugin)]
 #![feature(plugin_registrar)]
 #![feature(rustc_private)]