Configure Kernel TLS datapath

Allow users to disable ktls using the "no-ktls" option.
Also, disable ktls when cross-compiling, non-linux, or too-old-kernel.

Signed-off-by: Boris Pismenny <borisp@mellanox.com>

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Yang <yang.yang@baishancloud.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5253)