This reverts commit 6ff2e8f1.

Signed-off-by: Yang Keao <keao.yang@yahoo.com>

Only Netlink interface link attributes up IFLA_STATS are currently
available. This commit adds IFLA_COST to IFLA_PROTO_DOWN.

See https://github.com/torvalds/linux/blob/54ecb8f7/include/uapi/linux/if_link.h#L106

initial work from @landryb for OpenBSD, various fixes and NetBSD support from me.

Fixes #1585

Signed-off-by: Arthur Gautier <baloo@gandi.net>

Signed-off-by: Arthur Gautier <baloo@gandi.net>

Signed-off-by: Arthur Gautier <baloo@gandi.net>

Signed-off-by: Arthur Gautier <baloo@gandi.net>

Signed-off-by: patrick felt <patrick.felt@sling.com>

Co-Authored-By: gnzlbg <gnzlbg@users.noreply.github.com>

First batch for #1562

Add a new feature to enable this, since `const extern fn`
support is unstable

The ip_mreqn struct has an additional interface id parameter. This
allows programming IPv4 multicast groups using the interface id
alongside the src IPv4 address.
Linux has supported the ip_mreqn struct since Linux 2.2
ref: man ip.7

[Adding to linux x86_64 only as adding to linux_like/mod.rs caused
failures in the sparc64 and mips64 C regression tests]

adding PATH_MAX

use type c_int for _PARM_NAME_MAX and _PARM_PATH_MAX