/usr/share/lintian/overrides/libhashkit2 is in libhashkit2 1.0.18-4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Following Russ Allbery's advice on omitting symbols files for C++ libraries,
# this package does not use them either:
# http://www.eyrie.org/~eagle/journal/2012-02/001.html
libhashkit2: no-symbols-control-file usr/lib/x86_64-linux-gnu/libhashkit.so.2.0.0
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