Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

netlink: move NETLINK define to opt_global.h

Move the NETLINK define into opt_global.h so we can rely on it being
set correctly, without having to remember to include opt_netlink.h.
This ensures tha

netlink: move NETLINK define to opt_global.h

Move the NETLINK define into opt_global.h so we can rely on it being
set correctly, without having to remember to include opt_netlink.h.
This ensures that the NETLINK define is correctly set. If not we
may end up with unloadable modules, due to missing symbols (such as
nlmsg_get_group_writer).

PR: 274306
Reviewed by: imp, markj
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D42179

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sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

netlink: use netlink mbufs in the mbuf chains.

Continue D40356 and switch the remaining parts of mbuf-related
code to the Netlink mbufs.

Reviewed By: gallatin
Differential Revision: https://reviews

netlink: use netlink mbufs in the mbuf chains.

Continue D40356 and switch the remaining parts of mbuf-related
code to the Netlink mbufs.

Reviewed By: gallatin
Differential Revision: https://reviews.freebsd.org/D40368
MFC after: 2 weeks

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