/usr/share/lintian/overrides/gnash-ext-fileio is in gnash-ext-fileio 0.8.11~git20160109-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | gnash-ext-fileio: hardening-no-fortify-functions usr/lib/gnash/plugins/fileio.so
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