Previously, the hostname was initialized to `localhost'. If it was
not cleared by init_syslog, init_logger_addr (via openlog) would
query gethostbyname to find the IP address of `localhost', which will
essentially always be 127.0.0.1. But if it was cleared by
init_syslog, init_logger_addr would return 127.0.0.1 anyway.
This way, it always returns 127.0.0.1 in the event of no init_syslog
call, and avoids a DNS lookup. You can always force a DNS lookup by
passing `localhost' to init_syslog explicitly, of course.
I'm not sure if anything even uses this as a fallback in Heimdal, but
let's avoid leaving a rake to step on.
