Bug#910594: lintian: complain about missing versioned dependency on init-system-helpers

[Stuart Prescott <stuart@debian.org>]

Package: lintian
Version: 2.5.108
Severity: wishlist

Over in #910593, I reported that the maintainer script was using a feature of
update-rc.d that is not available in stretch. Could lintian spot that usage
in the maintainer script and, if a versioned dependency on init-system-helpers
is not found, complain? The 'defaults-disabled' option was introduced in
init-system-helpers 1.50. (One could also look for the dh_installinit call
in debian/rules, but looking in the binary package's postinst seems easier.)

regards
Stuart