This file is indexed.

/usr/share/lintian/overrides/libc6 is in libc6 2.24-11+deb9u4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# libpthread must be stripped specially; GDB needs the non-dynamic 
# symbol table in order to load the thread debugging library.
libc6: unstripped-binary-or-object */libpthread-2.24.so

# ld.so must be executable, otherwise the system will not work
libc6: shlib-with-executable-bit */ld-2.24.so 0755

# It is normal that the ELF dynamic linker does not need any other 
# library
libc6: shared-lib-without-dependency-information */ld-2.24.so

# dependency on debconf is not needed, as glibc has a fallback to tty 
libc6: missing-debconf-dependency-for-preinst

# this is a false positive because the string "ldconfig" is in preinst
libc6: preinst-calls-ldconfig

# we indeed embed a fork of libidn. We don't want a loop between libc and libidn
# anyway
libc6: embedded-library */libcidn-2.24.so: libidn