bug 3442: renamed the .lock file to .mutex for the flock-locking case, since it is really a mutual-exclusion semaphore, not a lock.  in other words, it sticks around after unlocking.
bug 3442: renamed the .lock file to .mutex for the flock-locking case, since it is really a mutual-exclusion semaphore, not a lock.  in other words, it sticks around after unlocking.

git-svn-id: d99324e817494df82bb0080d8e7ab74680731a10@20961 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin