FreeBSD_HEAD_arm64 - Build #896 - Fixed

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FreeBSD_HEAD_arm64 - Build #896 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/896/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/896/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/896/console

Change summaries:

286877 by jasone:
Re-add LG_SIZEOF_PTR definition for __aarch64__.

This definition was erroneously removed during the 4.0.0 import.

286874 by jasone:
Bump __FreeBSD_version for the jemalloc 4.0.0 import.

286873 by jch:
Make clear that TIME_WAIT timeout expiration is managed solely by
tcp_tw_2msl_scan().

Sponsored by:	Verisign, Inc.

286872 by jasone:
Add missing sdallocx updates and remove *allocm manpage links.

Submitted by:	jbeich

286871 by jasone:
Fix build failure due to missing CPU_SPINWAIT definition.