OpenVPN v2.4.12 release

2022.03.16 -- Version 2.4.12

Arne Schwabe (1):
      Remove always enabled USE_64_BIT_COUNTERS define

David Korczynski (1):
      Fix argv leaks in add_route() and add_route_ipv6()

David Sommerseth (1):
      plug-ins: Disallow multiple deferred authentication plug-ins

Gert Doering (2):
      Revert "Remove always enabled USE_64_BIT_COUNTERS define"
      Fix --mtu-disc maybe|yes on Linux.

Richard T Bonhomme (1):
      doc openvpn.8: Use free open-source dynamic-DNS provider URL

Selva Nair (2):
      Apply the connect-retry backoff to only one side of a connection
      Ensure the current common_name is in the environment for scripts
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