1ad36f0 Fix upstream bug 4385 and FTBFS with GCC 10

Authored and Committed by pghmcfc 4 years ago
    Fix upstream bug 4385 and FTBFS with GCC 10
    
    - Fix API tests compile failure with GCC 10
      https://github.com/proftpd/proftpd/pull/886
    
    - mod_sftp: When handling the 'keyboard-interactive' authentication mechanism,
      as used for (e.g.) PAM, make sure to properly handle DEBUG, IGNORE,
      DISCONNECT, and UNIMPLEMENTED messages, per RFC 4253
      (http://bugs.proftpd.org/show_bug.cgi?id=4385)
    
        
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