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* lisp/org/org-clock.el (org-clock--oldest-date): Fix an issue
when compiling on macOS 10.6 with a western time zone (a
continuation of Bug#27736).  In particular, see:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=27736#74

and the first commit that attempted to work around this problem,
"Workaround for faulty localtime() under macOS 10.6", bd49b6f1 of
2017-09-30.