/usr/share/lintian/overrides/libgtkglext1 is in libgtkglext1 1.2.0-3.2fakesync1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # There's no point in splitting these.
libgtkglext1: package-name-doesnt-match-sonames libgdkglext-x11-1.0-0 libgtkglext-x11-1.0-0
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