Deprecate io-surface

Author: madsmtm

io-surface/src/lib.rs

@@ -1,3 +1,4 @@
+//! This crate has been deprecated in favour of the `objc2-io-surface` crate.
 // Copyright 2013 The Servo Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution.
 //
@@ -7,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![deprecated = "use the objc2-io-surface crate instead"]
 #![crate_name = "io_surface"]
 #![crate_type = "rlib"]