/usr/share/lintian/overrides/libusbmuxd-dev is in libusbmuxd-dev 1.0.10-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Really a split off from usbmuxd, not a new package
new-package-should-close-itp-bug
|