Change the rewrite log lock from intra-process to lock-all (and we really can

log it if it fails).

Don't segfault if RewriteLock wasn't coded in the config (i.e., if
rewrite_log_lock isn't set).

Fix a missing error code in a call to ap_log_error().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86058 13f79535-47bb-0310-9956-ffa450edef68