Attempt to fix the segfaulting osx bots

Upon inspecting the core dumps, they're all segfaulting at the same instruction
with the same value in a register that looks fishy. It appears to be indexing
into an array with a -1 index and then getting some weird overflow and dying.

I have attempted to fix this as part of
alexcrichton/libuv@fd5308383c575472edb2163d823dc6670bf59609,
but I am unsure of whether this is the actual cause of the problem, so I am not
going to upstream it just yet. I have a fairly high confidence that this is
indeed the problem, but I want to make sure that the bots to segfault all over
the place before upstreaming.

1 files changed, 0 insertions, 0 deletions

diff --git a/src/libuv b/src/libuv
-Subproject 2207d4ab078d605138e60d72f0c91667291a346
+Subproject fd5308383c575472edb2163d823dc6670bf5960