Log Message:
Update to gnupg21-2.1.16.

 * gpg: New algorithm for selecting the best ranked public key when
   using a mail address with -r, -R, or --locate-key.
 * gpg: New option --with-tofu-info to print a new "tfs" record in
   colon formatted key listings.
 * gpg: New option --compliance as an alternative way to specify
   options like --rfc2440, --rfc4880, et al.
 * gpg: Many changes to the TOFU implementation.
 * gpg: Improve usability of --quick-gen-key.
 * gpg: In --verbose mode print a diagnostic when a pinentry is
   launched.
 * gpg: Remove code which warns for old versions of gnome-keyring.
 * gpg: New option --override-session-key-fd.
 * gpg: Option --output does now work with --verify.
 * gpgv: New option --output to allow saving the verified data.
 * gpgv: New option --enable-special-filenames.
 * agent, dirmngr: New --supervised mode for use by systemd and alike.
 * agent: By default listen on all available sockets using standard
   names.
 * agent: Invoke scdaemon with --homedir.
 * dirmngr: On Linux now detects the removal of its own socket and
   terminates.
 * scd: Support ECC key generation.
 * scd: Support more card readers.
 * dirmngr: New option --allow-version-check to download a software
   version database in the background.
 * dirmngr: Use system provided CAs if no --hkp-cacert is given.
 * dirmngr: Use a default keyserver if none is explicitly set
 * gpgconf: New command --query-swdb to check software versions
   against an copy of an online database.
 * gpgconf: Print the socket directory with --list-dirs.
 * tools: The WKS tools now support draft version -02.
 * tools: Always build gpg-wks-client and install under libexec.
 * tools: New option --supported for gpg-wks-client.
 * The log-file option now accepts a value "socket://" to log to the
   socket named "S.log" in the standard socket directory.
 * Provide fake pinentries for use by tests cases of downstream
   developers.
 * Fixed many bugs and regressions.
 * Many changes and improvements for the test suite.