LICENSE: add node-weak

LICENSE

@@ -551,6 +551,24 @@ maintained libraries. The externally maintained libraries used by Node are:
     THE SOFTWARE.
   """
 
+- test/gc/node_modules/weak. Node-weak is a node.js addon that provides garbage
+  collector notifications. Node-weak's license follows:
+  """
+    Copyright (c) 2011, Ben Noordhuis <info@bnoordhuis.nl>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+  """
+
 - src/ngx-queue.h. ngx-queue.h is taken from the nginx source tree. nginx's
   license follows:
   """