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Until now we only had optind defined in the header.
Since we are using the BSD getopt variant add opterr and optopt.
Fixes: 3ec06ea9c6 ("ovn-nbctl: Initial support for daemon mode.")
Signed-off-by: Alin Gabriel Serdean <aserdean@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>