openssl: adaptations for combined handshakes and the PQC era

Now that PQC is in OpenSSL 3.5 by default,
handshakes will took longer, as the can combine
a PQC algorithm with a conventional one.

Therefore add the elliptic curve optimization
for x86_64 which Arch Linux is also using by
default (enable-ec_nistp_64_gcc_128).

Furthermore, make the security level configurable
for power users. Setting this to 5 will only allow for
connections with security strength 256 bit. Please
beware, that this may lead to no common cipher and key
lengths (no connection at all). Set to OpenSSL's default
when not set (2 for OpenSSL 3.5).

Signed-off-by: Markus Theil <theil.markus@gmail.com>

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