suexec: Add support for logging to syslog as an alternative to a

logfile.

* support/suexec.c (err_output) [AP_LOG_SYSLOG]: Log to syslog.
  (main): Close syslog fd if open, before execv.  Add -V output
  for AP_LOG_SYSLOG.

* configure.in: Add --with-suexec-syslog argument; allow
  --without-suexec-logfile to omit definition of AP_LOG_EXEC.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1341905 13f79535-47bb-0310-9956-ffa450edef68