Bug#650325: [checks/cruft] emits ancient-libtool when using dh-autoreconf

[Felix Geyer <debfx-pkg@fobos.de>]

Package: lintian
Version: 2.5.4
Severity: normal

lintian emits the ancient-libtool tag even though a package uses dh-autoreconf.

This check in checks/cruft should be extended to cover dh-autoreconf:
my $ltinbd  = $info->relation('build-depends-all')->implies('libtool');