git equivalent of svn r-number

[Robert Huff]

	Right now, I (usually) start problem reports with an invocation
of uname that includes the r-number:

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	On a system running:

FreeBSD 13.0-CURRENT #0 r365372: Sun Sep  6 10:51:26 EDT 2020 amd64 

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	I don't know how to produce the git equivalent.  (Checked the
manual; nothing.)


			Respectfully,


				Robert Huff

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