Replace hardcoded SVR4 || linux || CSRG_BASED with an autoconf check and the _POSIX_SAVED_IDS macro. Suggested-by: Mark Kettenis <mark.kettenis@xs4all.nl> Signed-off-by: Julien Cristau <jcristau@debian.org> Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com> Reviewed-by: Mark Kettenis <kettenis@openbsd.org>. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>