* tools/dev/unix-build/Makefile.svn: For the bb-openbsd bot, fix the
   build of HTTPD 2.2.29 with recent versions of LibreSSL which introduced
   the API function SSL_CTX_use_certificate_chain (Apache HTTPD defines
   its own implementation of this function using the exact same name ?!?)


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1634514 13f79535-47bb-0310-9956-ffa450edef68