www-cgi/: Allow customization of the environment filters.

[userv-utils] / ipif / ipif

if ( grep calling-user-shell /etc/shells
   & glob service-user root
   )
        reset
        no-set-environment
        no-suppress-args
        no-disconnect-hup
        execute /usr/lib/userv/ipif /etc/userv/ipif-networks --
fi