The folks at OpenSSL have been very busy cleaning up
it's API. So much that it broken vtls/openssl.c:

  vtls/openssl.c(1670) : error C2037: left of 'ssl_version' specifies
    undefined struct/union 'ssl_session_st'

for the statement:
    switch(session->ssl_version) {

'struct ssl_session_st' is now specified in ssl/ssl_locl.h.
Is there a function/macro for that now? Or maybe we can assume
'ssl_version' is first in 'SSL_SESSION', we can simply do:

#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && 0
struct ssl_session_st {
        int ssl_version;
      };
#endif

   ...

    switch(session->ssl_version) {

-- 
--gv
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