http: restore CRLF export

Author: wlgh1553

lib/_http_common.js

@@ -262,6 +262,7 @@ module.exports = {
   _checkIsHttpToken: checkIsHttpToken,
   chunkExpression: /(?:^|\W)chunked(?:$|\W)/i,
   continueExpression: /(?:^|\W)100-continue(?:$|\W)/i,
+  CRLF: '\r\n', // TODO: Deprecate this.
   freeParser,
   methods,
   parsers,