Log Message:
openvpn: updated to 2.6.4

Overview of changes in 2.6.4

User visible changes

License amendment: all NEW commits fall under a modified license that explicitly \ 
permits linking with Apache2 libraries (mbedTLS, OpenSSL) - see COPYING for \ 
details. Existing code will fall under the new license as soon as all \ 
contributors have agreed to the change - work ongoing.

New features

DCO: support kernel-triggered key rotation (avoid IV reuse after 2^32 packets). \ 
This is the userland side, accepting a message from kernel, and initiating a TLS \ 
renegotiation. As of release, only implemented in FreeBSD kernel.

Bug fixes

fix pkcs#11 usage with OpenSSL 3.x and PSS signing
fix compile error on TARGET_ANDROID
fix typo in help text
manpage updates (--topology)
encoding of non-ASCII windows error messages in log + management fixed (use UTF8 \ 
"as for everything else", not ANSI codepages)