Error out when forcing an unsupported TLS version

If the result of a SSL_{CTX_,}set_{min,max}_proto_version() call
leaves the min and max version identical, and support for that version
is compiled out of the library, return an error.  Such an object has
no hope of successfully completing a handshake, and this error may
be easier to decipher than the resulting handshake failure.

Reviewed-by: Rich Salz <rsalz@openssl.org>

(cherry picked from commit c8feba723a33e15201009d716d9ead02e653dfe6)

Updated the cherry-pick to not reference TLS1_3_VERSION, which does
not exist on this branch.

(Merged from https://github.com/openssl/openssl/pull/4376)

0 files changed, 0 insertions, 0 deletions