streams: use strict on _stream_wrap

A Mostly Harmless™ change to enable 'use strict' mode in _stream_wrap, bringing it in line with /all/ the other modules.

PR-URL: #1279
Reviewed-By: Brian White (@mscdex) <[email protected]>
Reviewed-By: Roman Reiss (@silverwind) <[email protected]>
Reviewed-By: Yosuke Furukawa (@yosuke-furukawa)
<[email protected]>

Author: brendanashworth

lib/_stream_wrap.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const util = require('util');
 const Socket = require('net').Socket;
 const JSStream = process.binding('js_stream').JSStream;