libifconfig: Add netlink based helper to bring the interface up/down

Adds `ifconfig_set_up()` to set and unset the `IFF_UP`
on a network interface using `RTM_NEWLINK`.

Sponsored by: Google LLC (GSo

libifconfig: Add netlink based helper to bring the interface up/down

Adds `ifconfig_set_up()` to set and unset the `IFF_UP`
on a network interface using `RTM_NEWLINK`.

Sponsored by: Google LLC (GSoC)
Reviewed by: obiwac, mckusick (mentor), kp
Approved by: obiwac, mckusick (mentor), kp
Differential Revision: https://reviews.freebsd.org/D52128

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Remove redundant PACKAGE for INTERNALLIB libraries

These libraries don't install anything, so they shouldn't have a
PACKAGE setting. This avoids surprising behaviour in future if
e.g. manpages are

Remove redundant PACKAGE for INTERNALLIB libraries

These libraries don't install anything, so they shouldn't have a
PACKAGE setting. This avoids surprising behaviour in future if
e.g. manpages are added to an internal library.

Reported by: des
Differential Revision: https://reviews.freebsd.org/D51901

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libifconfig: Remove ifconfig_set_fib and ifconfig_sfp_id_is_qsfp

Remove the declaration of ifconfig_set_fib from libifconfig.h as it had
no definition.

ifconfig_sfp_id_is_qsfp is defined as a stati

libifconfig: Remove ifconfig_set_fib and ifconfig_sfp_id_is_qsfp

Remove the declaration of ifconfig_set_fib from libifconfig.h as it had
no definition.

ifconfig_sfp_id_is_qsfp is defined as a static header function in
libifconfig_sfp.h and doesn't generate a symbol.

Both have been removed from Symbol.map.

Reviewed by: obiwac, mckusick (mentor)
Approved by: obiwac, mckusick (mentor)
Sponsored by: Google LLC (GSoC)
Differential Revision: https://reviews.freebsd.org/D50666

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