Log Message:
Update net/tor to version 0.4.1.6.

Notable changes in version 0.4.1.6 - 2019-09-19
  This release backports several bugfixes to improve stability and
  correctness.  Anyone experiencing build problems or crashes with 0.4.1.5,
  or experiencing reliability issues with single onion services, should
  upgrade.

  o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
    - Tolerate systems (including some Android installations) where
      madvise and MADV_DONTDUMP are available at build-time, but not at
      run time. Previously, these systems would notice a failed syscall
      and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
    - Tolerate systems (including some Linux installations) where
      madvise and/or MADV_DONTFORK are available at build-time, but not
      at run time. Previously, these systems would notice a failed
      syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.

  o Minor bugfixes (controller protocol):
    - Fix the MAPADDRESS controller command to accept one or more
      arguments. Previously, it required two or more arguments, and ignored
      the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.

  o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
    - When tor is missing descriptors for some primary entry guards,
      make the log message less alarming. It's normal for descriptors to
      expire, as long as tor fetches new ones soon after. Fixes bug
      31657; bugfix on 0.3.3.1-alpha.

  o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
    - Change log level of message "Hash of session info was not as
      expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
      on 0.1.1.10-alpha.

  o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
    - Always retry v2 single onion service intro and rend circuits with
      a 3-hop path. Previously, v2 single onion services used a 3-hop
      path when rendezvous circuits were retried after a remote or
      delayed failure, but a 1-hop path for immediate retries. Fixes bug
      23818; bugfix on 0.2.9.3-alpha.

  o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
    - Always retry v3 single onion service intro and rend circuits with
      a 3-hop path. Previously, v3 single onion services used a 3-hop
      path when rend circuits were retried after a remote or delayed
      failure, but a 1-hop path for immediate retries. Fixes bug 23818;
      bugfix on 0.3.2.1-alpha.
    - Make v3 single onion services fall back to a 3-hop intro, when all
      intro points are unreachable via a 1-hop path. Previously, v3
      single onion services failed when all intro nodes were unreachable
      via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.