FreeBSD_HEAD_arm64 - Build #4602 - Fixed

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FreeBSD_HEAD_arm64 - Build #4602 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/4602/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/4602/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/4602/console

Change summaries:

311990 by sbruno:
Purge surprise change to sys/conf/files for ixgbe(4).

Reported by:	imp

311989 by cem:
libkern: Remove obsolete 'register' keyword

Sponsored by:	Dell EMC Isilon

311988 by sbruno:
Purge EM_MULTIQUEUE references from the man page for em(4).

311987 by bms:
Allow uart(4) to use MSI interrupts on single-port PCI instances.

Do this here as puc(4) disallows single-port instances; at least
one multi-port PCIe UART chip (in this case, the ASIX MCS9922)
present separate PCI configuration space (functions) for each UART.

Tested using lrzsz and a null-modem cable. The ExpressCard/34
variants containing the MCS9922 should also use MSI with this change.

Reviewed by:		jhb, imp, rpokala
MFC after:		2 weeks
Differential Revision:	https://reviews.freebsd.org/D9123

311986 by sbruno:
Fix panic on mb_free_ext() due to NULL destructor.

This used to happen because of the SET_MBUF_DESTRUCTOR() called
on unregif.

Submitted by:	Vincenzo Maffione <v.maffione at gmail.com>

311985 by asomers:
Fix uninitialized variable CIDs in route6d

The variables in question are actually return arguments, but it's still good
form to initialize them.

Reported by:	Coverity
CID:		979679 979680
MFC after:	4 weeks
Sponsored by:	Spectra Logic Corp

311984 by kib:
For the main binary, postpone enforcing relro read-only protection
until copy relocations are done.

Newer binutils and lld seems to output copy into relro-protected range.

Reported by: Rafael Espц╜ndola via emaste
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week