openvpn: update to 2.6.10

openvpn: update to 2.6.10

This is a bugfix release containing several security fixes specific to the Windows platform.

Bug fixes
---------
- Windows: if the win-dco driver is used (default) and the GUI requests
  use of a proxy server, the connection would fail.  Disable DCO in
  this case.

- Compression: minor bugfix in checking option consistency vs. compiled-in
  algorithm support

- systemd unit files: remove obsolete syslog.target

Security fixes
--------------
- CVE-2024-27459: Windows: fix a possible stack overflow in the
  interactive service component which might lead to a local privilege
  escalation.

- CVE-2024-24974: Windows: disallow access to the interactive service
  pipe from remote computers.

- CVE-2024-27903: Windows: disallow loading of plugins from untrusted
  installation paths, which could be used to attack openvpn.exe via
  a malicious plugin.

For details refer to https://github.com/OpenVPN/openvpn/blob/v2.6.10/Changes.rst

Signed-off-by: Ivan Pavlov <AuthorReflex@gmail.com>