nixos/lighttpd: add missing modules to allKnownModules
The output of ./configure shows all modules/plugins, both enabled and
disabled. With this info we can finally build the _complete_ list of
modules. We were missing these:
mod_authn_gssapi
mod_authn_ldap
mod_geoip
(I hit this as I was building lighttpd with ldap support and the NixOS
module said ldap was unsupported, due to these missing entries in
allKnownModules.)
(cherry picked from commit d26f8b5e00b4a436ec8f9b7fb1b55a0dbda440c5)
