Workaround pure-ftpd connections failing with "Unknown command" #190
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pure-ftpd 1.0.49-4 as supplied as part of Ubuntu 20.04 advertises UTF8
support in the FEAT command but the OPTS command fails to turn it on.
This patch introduces a workaround to ignore the error which enables
this library to work with this version of pure-ftpd. Filezilla appears
to ignore this error in a similar way.