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/etc/resolvconf/update-libc.d/sendmail is in sendmail-base 8.14.4-4+deb7u1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# Make sendmail aware of changes to resolv.conf
# so that we can reset the statistics for unresolvable hostnames

# Bring in some script functions to handle dynamic configuration
. /usr/share/sendmail/dynamic;

# Note the interface that just changed - unfortunately, we know not how :(
update_resolv;

# If anything has been changed, update sendmail.cf and reload
update_sendmail;