folly: add freebind to async udp socket
Summary: This is useful if we want to bind to a nonlocal address or an address that doesn't exist yet. IP_FREEBIND (since Linux 2.4) If enabled, this boolean option allows binding to an IP address that is nonlocal or does not (yet) exist. This permits listening on a socket, without requiring the underlying network interface or the specified dynamic IP address to be up at the time that the application is trying to bind to it. This option is the per-socket equivalent of the ip_nonlocal_bind /proc interface described below. Reviewed By: yfeldblum, mjoras Differential Revision: D30903919 fbshipit-source-id: 09058cac1c14a4003525b0a7c5381ea301ca28da
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