Suppress "error(0)" messages for ap_log_error() when the APLOG_NOERRNO

is unset (as it is in situations like timeouts) where it is unclear
whether errno is set or not. It is questionable whether the ap_log_error()
timeout calls in http_protocol should not have an APLOG_NOERRNO as well.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81056 13f79535-47bb-0310-9956-ffa450edef68