Re: getprogname: Move declaration from "getprogname.h" to <stdlib.h>

[Bruno Haible]

Paul Eggert wrote:
> I ... wouldn't object to a very short transition period

Short transition periods tend to cause unnecessary hassle to some users.
I therefore favour 1 year or 2 years as a transition period.

> since the current #warning is something I would treat 
> like a diagnostic that getprogname.h is missing.

I don't understand. Is the #warning that I added misleading? Then, by
all means, please provide a better message. (The compiler typically
reports the location of the warning; so, from the compiler's diagnostic
it should be clear that there still is a getprogname.h. No?)

Bruno