If HAVE_SYSLOG, fix the APLOG_* symbols to use the syslog.h definitions

and the syslog-dependent mask for the priority level.  Allow APLOG_NOTICE
to bypass the priority level when not logging to syslog.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79337 13f79535-47bb-0310-9956-ffa450edef68