On the 1.3.x-sslbuild branch: Merge from 1.3.x, resovling conflicts.

The only merge conflict was due to the introduction of the
bio_file_ctrl() function in buckets/ssl_buckets.c.


git-svn-id: https://svn.apache.org/repos/asf/serf/branches/1.3.x-sslbuild@1910116 13f79535-47bb-0310-9956-ffa450edef68