Fix observed race-condition resulting in the HOSTNAME @-code being blank.
Eliminate the hack in each server where it will over-write startup host_name (with the configured Internet email address), if it's blank. This hack was subject to a race condition where the parent app (e.g. sbbsctrl.exe) would clear or re-initialize the host_name after the sever threads had initialized. Instead, just use a function which will return either the startup->host_name or (fallback to) scfg.inet_addr.