FreeBSD_HEAD_arm64 - Build #2191 - Fixed

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FreeBSD_HEAD_arm64 - Build #2191 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2191/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2191/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2191/console

Change summaries:

294591 by fanf:
Update whois synopsis and usage with new options

294590 by emaste:
Restore libunwind.cpp to LLVM libunwind build (reverts r294576)

The unw_* functions are not exported, but are used internally.

294582 by jilles:
sh: Add already working test for local-readonly interaction.