build-sys: restore make distcheck's configure flags

They got lost with --enable-most-builds in 08b1c219.

Note we don't add --with-systemd because there are still many
systems where systemd is not available.

Would be nice to have --enable-gtk-doc too but out-of-tree build has
to be fixed first.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>