krb5/krb5 — pull request #216 by greghudson (2014-10-07 16:17:05+00:00)
Title: Use OFD locks where available

Linux 3.15 has added OFD locks, which contend with POSIX file locks
but are owned by the open file description instead of the process.
Use these in krb5_lock_file where available, for safer concurrency
behavior.