security/openvpn-devel: upgrade to commit 64fae9d829

this brings in the upstream development work that has happened over
the last two months, plus two CVE fixes:

• fix race condition in TLS handshake that could lead to leaking of packet data from a previous handshake under specific circumstances (CVE-2026-40215)
  
  (Bug found by XlabAI Team of Tencent Xuanwu Lab (xlabai@tencent.com))
• fix server ASSERT() on receiving a suitably malformed packet with a valid tls-crypt-v2 key (CVE-2026-35058)
  
  (Bug found by XlabAI Team of Tencent Xuanwu Lab (xlabai@tencent.com) and independently by Emma Reuter of Cisco ASIG (TALOS-2026-2381))

besides this, most of the commits are code maintenance - modernizing
code, adjusting OpenSSL APIs used to be 4.0 compatible, adding more
unit tests, fixing integer related warnings, improve documentation,
some minor performance improvements wrt internal hashing.

Notable change for FreeBSD: fix use of ovpn(4) on kernels compiled
without INET (change use of ioctl() sockets to AF_LOCAL).

PR: 294712