According to the tag description¹, there are legitimate cases where the
library is not linked to libc, in which case lintian will still
complain. It looks like this is such a situation, because the library
is not underlinked.² So I would simply add an override.
Best,
¹ https://lintian.debian.org/tags/library-not-linked-against-libc.html
² If it were underlinked, the following command would give a list of
missing functions:
ldd -r /usr/lib/x86_64-linux-gnu/octave/packages/stk-2.5.1/x86_64-pc-linux-gnu-api-v52/__stk_dist_pairwise__.mex