Re: argp: Correct documentation

[Alfred M. Szmidt]

    Portability problems fixed by Gnulib:
    @itemize
   +@item
   +This variable is missing on all non-glibc platforms:

How about we just say "non-GNU systems" -- the majority of operating
systems in the world are 'non-glibc platforms', and there is no
platform that is called 'glibc'.  Our system is called GNU after
all...