Description of problem:

systemd_myhostname returns ipv6 address for local host even when ipv6 is
disabled

Version-Release number of selected component (if applicable):

glibc-2.28-225.el8.x86_64
systemd-libs-239-74.el8_8.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Disable IPv6

1. sysctl -w net.ipv6.conf.all.disable_ipv6=1

2. Set the host name to something not in /etc/hosts nor in DNS

1. hostnamectl set-hostname nowhere
2. hostname
   nowhere
3. hostname -f
   nowhere

3. Query the hosts database using the three services:

1. getent -s files hosts nowhere
2. getent -s dns hosts nowhere
3. getent -s myhostname hosts nowhere

Actual results:

::1 nowhere localhost

Expected results:

The machine IPv4 address, e.g.

192.168.122.71 nowhere

Additional info:

Same results are seen on RHEL 9. It should not return an IPv6 address with
net.ipv6.conf.all.disable_ipv6=1.

Repeating the same test on a fully updated RHEL 7.9, we get

1. getent -s myhostname hosts nowhere
   192.168.122.71 nowhere