For wrpc-sw, this depends on a similar commit in wrpc-sw, because
arch-wrpc relies on that implementation (to avoid building two of them).
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

The contents of this directory are pretty portable anyways, and
the internal files were actually called "posix-io.c" and so on.
So let's get rid of the too-politica "gnu-linux" naming and of
the too-little-political "posix" at the same time.  We build
on Unix roots, so let's call our architecture like that.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Aurelio Colosimo <aurelio@aureliocolosimo.it>