RCS should use "diff --label", not "diff -L", with GNU diff

Paul Eggert <[email protected]> Sun, 08 Jan 2012 12:06:00 -0800

Newsgroups	gmane.comp.version-control.rcs.bugs
Organization	UCLA Computer Science Department
Message-ID	<[email protected]>

Currently RCS uses GNU diff's -L option.
That option has been undocumented since diffutils 2.8
(released in March 2002) and the option is intended to
be replaced sometime soon with a different meaning.

Can you please fix RCS so that it uses "diff --label"
instead of "diff -L"?  That will make RCS immune to this
planned change.  Thanks.