deps: upgrade libuv to 1.9.0

Fixes: https://github.com/nodejs/node/issues/5737
Fixes: https://github.com/nodejs/node/issues/4643
Fixes: https://github.com/nodejs/node/issues/4291
Fixes: https://github.com/nodejs/node-v0.x-archive/issues/8960
Refs: https://github.com/nodejs/node/pull/3594
PR-URL: https://github.com/nodejs/node/pull/5994


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>