Notable changes:
* Add --with-pidfile to allow override the path to syslogd's pidfile.
* Update my email address.
* Remove advertising clause from my license.
Use --with-pidfile when building on NetBSD so that chroot/sandbox
builds default to the correct path for syslogd.pid.
* Use correct ends of pipefd[] (as returned by pipe(2)).
* Fix '%f' escape in (pre|post)processor argument.
Previous two fixes provided by Stoned Elipot.