We may not have permission to open "/". This fix allows libuv to be
used in a OS X app that has sandboxing enabled, without the need for
a temporary entitlement to allow reading of "/" (Which would never
pass app review).
In some rare cases "/dev" isn't mounted, so we open "/" as a
fallback.
PR-URL: https://github.com/libuv/libuv/pull/328
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
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