Add os.NODEV

[serhiy-storchaka]

NODEV is not a part of Posix, but it is defined as (dev_t)-1 on many systems (in particularly, on Linux, FreeBSD, NetBSD, OpenBSD, OpenIndiana). It is used to denote non-existing or undefined value for dev_t values.

On Linux, FreeBSD and OpenIndiana major(NODEV), minor(NODEV) and makedev(NODEV, NODEV) return NODEV. Unfortunately, this is not so on NetBSD and OpenBSD, but anyway it can be useful.

Linked PRs

• gh-138712: Add os.NODEV #138728