[tz] make traditional_tarballs fails on macOS for 2022b

[Guy Harris]

On Aug 10, 2022, at 6:15 PM, Deborah Goldsmith via tz <tz at iana.org> wrote:

> Also note that macOS does not have nroff installed, but that doesn’t look like a fatal error.

It appears that macOS has joined Team Mandoc (at least as of Big Sur, if not earlier):

	https://mandoc.bsd.lv

	https://en.wikipedia.org/wiki/Mandoc

so perhaps workman.sh should take the formatting command as an argument and Makefile should offer a choice of "nroff" or "mandoc" as the command.

("macOS, SUN Solaris, and *IRIX*"?)