make and RCS. was RCS and SCCS

[Guy Harris]

> We're not exactly sure who invented it.  I don't know where we got it
> from, but it was somewhere.

Stu Feldman, author of the original "make", probably; I think he discussed it
at a talk here, and the authors of the "SunPro make" (the optional "make" in
SunOS 3.5 and later, and the standard "make" in 4.0) picked it up from there.

> I have not heard of Sun's Make doing anything of the kind.  What
> version are you using?

Well, now you have.  Presumably, they're using the "SunPro make" version.