Update libuv to rebase on top of joyent/master

alexcrichton · alexcrichton · commit 3beb7adf1a57 · 2013-08-28T20:44:46.000-07:00
Closes #8829
diff --git a/src/libuv b/src/libuv
@@ -1 +1 @@
-Subproject commit ef2bcd134164adcaa072dcb56e62b737fdcb075e
+Subproject commit d88cf5652a1afb23939da0bae86c70ec521b9921
