Update to 1.969
    
    - New upstream release 1.969
      - Fix set_defaults to match documentation regarding short names
      - New function set_args_filter_hack to make it possible to override bad SSL
        settings from other code at the last moment
      - Determine default_ca on module load (and not on first use in each thread)
      - Don't try default hostname verification if verify_mode 0
      - Fix hostname verification when reusing context