/usr/share/lintian/overrides/postfix-lmdb is in postfix-lmdb 3.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | postfix-lmdb: postinst-has-useless-call-to-ldconfig
postfix-lmdb: postrm-has-useless-call-to-ldconfig
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