/usr/share/lintian/overrides/courier-imap is in courier-imap 4.9.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | courier-imap: binary-or-shlib-defines-rpath ./usr/bin/imapd /usr/lib/courier-authlib
courier-imap: binary-or-shlib-defines-rpath ./usr/lib/courier/courier/imaplogin /usr/lib/courier-authlib
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