K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2021-09-24T00:59:58.893345Z
K 7
svn:log
V 512
readelf: document that -u / --unwind is not yet implemented

ELF tool chain readelf accepts -u / --unwind but just ignores the
option.  This was previously undocumented, which could be confusing for
someone encountering `readelf -u` (in a script or GNU readelf example).

Reported by:	markj (in D32003)
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit deef4b8ce8ba7292fe5088bf9f6d4e2e35662fe8)

Git Hash:   8c495a9f4998e0a995705cab3446aa4f303a302d
Git Author: emaste@FreeBSD.org
END