Handle not being defined of OPENSSL_VERSION_NUMBER as a legacy OpenSSL
instead of as a future version.

* buckets/ssl_buckets.c
  Tweak #if.


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1750466 13f79535-47bb-0310-9956-ffa450edef68
1 file changed