Simplify sys/compat/sys/sockio.h. No functional change intended.

- Move some definitions from sys/compat/sockio.h to compat/net/if.h.
struct oif_data in sockio.h and if_data50 are the same, so remove oif_data.
Do the same thing to oifdatareq, too.
- u_quad_t -> uint64_t. No functional change.

s/u_quad_t/uint64_t/. No functional change.

Remove clause 3 and 4 leftovers from TNF licenses in more sources.

Confirmed by martin@ in PR/54760.

branches: 1.4.14; 1.4.16; 1.4.20;
Add ifam_pid and ifam_addrflags to ifa_msghdr.
Re-version RTM_NEWADDR, RTM_DELADDR, RTM_CHGADDR and NET_RT_IFLIST.
Add compat code for old version.

branches: 1.3.14; 1.3.32; 1.3.36;
Add a new AF/PF_ROUTE which is 64-bit clean which makes the routing socket
interface (and its associated sysctls) act identically for both 32 and 64 bit
programs. The old unclean one remains for backward compatibility.

branches: 1.2.2; 1.2.4; 1.2.10; 1.2.12; 1.2.14;
merge christos-time_t

branches: 1.1.2; 1.1.6;
file if.h was initially added on branch christos-time_t.

Introduce rt_addrmsg_src which adds RTA_AUTHOR to the message.
Use this when we notify userland of a duplicate address
and set RTA_AUTHOR to the hardware address of the sender.

While here, match the logging diagnostic of INET6 to the simpler one
of INET so it's consistent.

rtsock: Route address message simplification

Rename rt_newaddrmsg to rt_addrmsg_rt.
Add rt_addrmsg which drops the error and route arguments which are only
needed by one caller.

branches: 1.2.14; 1.2.16;
Add ifam_pid and ifam_addrflags to ifa_msghdr.
Re-version RTM_NEWADDR, RTM_DELADDR, RTM_CHGADDR and NET_RT_IFLIST.
Add compat code for old version.

branches: 1.1.2; 1.1.4; 1.1.8; 1.1.20; 1.1.38; 1.1.42;
Add a new AF/PF_ROUTE which is 64-bit clean which makes the routing socket
interface (and its associated sysctls) act identically for both 32 and 64 bit
programs. The old unclean one remains for backward compatibility.

Fix comment. No fucntional change.

branches: 1.2.4;
Merge the [pgoyette-compat] branch

branches: 1.1.2;
file route_50.h was initially added on branch pgoyette-compat.

branches: 1.2.4;
Merge the [pgoyette-compat] branch

branches: 1.1.2;
file route_70.h was initially added on branch pgoyette-compat.