/usr/share/lintian/overrides/xfce4-dev-tools is in xfce4-dev-tools 4.12.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # we do build with hardening flags
xfce4-dev-tools: hardening-no-stackprotector usr/bin/xdt-csource
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