git commit for WITH_DETECT_TZ_CHANGES breaks date, et al

From: Michael Butler via freebsd-current <freebsd-current_at_freebsd.org>
Date: Mon, 13 Sep 2021 21:30:02 -0400
After commit ddedf2a11eb20af1ee52cb3da70a57c21904af8f date fails to 
recognize any configured timezone when WITH_DETECT_TZ_CHANGES is not set.

For example ..

imb_at_vm01:/home/imb> date
Tue Sep 14 01:25:57  2021

Every other daemon also thinks it's running in UTC+0 :-(

When libc is recompiled with WITH_DETECT_TZ_CHANGES=yes in 
/etc/src.conf, the output is (for me) ..

imb_at_vm01:/usr/src/lib/libc> date
Mon Sep 13 21:28:29 EDT 2021

	imb
Received on Tue Sep 14 2021 - 01:30:02 UTC

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