Log message:
Fix Solarish builds: link with -lsocket for shutdown(2).

Log message:
SUBST_CLASSES+=djberrno to fix Linux build.

Log message:
Add superscript-httpd, some HTTP daemons designed to complement publicfile.

cgi-httpd, cgiuser-httpd, constant-httpd, echo-httpd, and redir-httpd
are HTTP daemons designed to complement publicfile.

Each instance of an shttpd daemon listens on a separate address, in a
chroot directory (except for cgiuser-httpd), typically running as a
nonprivileged user.