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When getnameinfo is used to lookup IPv4-mapped addresses in /etc/hosts, matching records are not found.

This is a regression relative to Red Hat Enterprise Linux 8.

Upstream patchwork link:
https://patchwork.sourceware.org/project/glibc/patch/mvmjzuwchbq.fsf@suse.de/

Upstream commit:

commit c437631485a85c3bd034e12f53dd1c8207f05940
Author: Andreas Schwab <schwab>
Date:   Wed Jul 19 09:55:31 2023 +0200

    Restore lookup of IPv4 mapped addresses in files database (bug 25457)
    
    This was broken by commit 9c02d0784d ("nss_files: Remove RES_USE_INET6
    from hosts processing"), which removed too much.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (glibc bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6582