Merge branch 'expand-cmsg_ipv6-sh-with-ipv4-support'

Willem de Bruijn says:

====================
expand cmsg_ipv6.sh with ipv4 support

Expand IPV6_TCLASS to also cover IP_TOS.
Expand IPV6_HOPLIMIT to also cover IP_TTL.

A series of two patches for basic readability (patch 1 is a noop),
and so that git does not interpret code changes + file rename as
a whole file del + add.
====================

Link: https://patch.msgid.link/20250225022431.2083926-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>