FreeBSD_HEAD_arm64 - Build #4556 - Fixed

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FreeBSD_HEAD_arm64 - Build #4556 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/4556/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/4556/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/4556/console

Change summaries:

311584 by ngie:
Unbreak lib/libsysdecode after r311568 by decoding MSG_MORETOCOME flag
in msgflags

MFC after:	1 month
X-MFC with:	r311568
Pointyhat to:	jhb
Reported by:	cy
Submitted by:	Michael Butler <imb at protected-networks.net>
Sponsored by:	Dell EMC Isilon

311583 by adrian:
[net80211] add syncflags methods for the VHT flags configuration.

I missed this in my last commit.  Pointy hat to me.