Added the APLOG_TOCLIENT flag to ap_log_rerror() to

Added the APLOG_TOCLIENT flag to ap_log_rerror() to
explicitly tell the server that warning messages should be sent
to the client in addition to being recorded in the error log.
Prior to this change, ap_log_rerror() always sent warning
messages to the client. In one case, a faulty CGI script caused
the server to send a warning message to the client that contained
the full path to the CGI script. This could be considered a
minor security exposure.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94744 13f79535-47bb-0310-9956-ffa450edef68