Uses AppVeyor. Buidlds will be manually triggered when a tag is created
and uploaded to dist.libuv.org by a maintainer.
Refs: https://github.com/libuv/libuv/pull/359
PR-URL: https://github.com/libuv/libuv/pull/449
Reviewed-By: Bert Belder <bertbelder@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
