Update 'nix-upstream' sub-module; adjust build system, doc, and substituter.

* nix-upstream: Update sub-module.
* daemon.am (libutil_a_SOURCES): Add affinity.cc.
  (libutil_headers): Add affinity.hh.
  (libexec_PROGRAMS, nix_setuid_helper_SOURCES,
  nix_setuid_helper_CPPFLAGS, nix_setuid_helper_LDADD): Remove.
* doc/guix.texi (Setting Up the Daemon): Remove paragraph about
  'nix-setuid-helper'.
* guix/scripts/substitute-binary.scm (guix-substitute-binary): Exit 0 when
  %CACHE-URL has an HTTP scheme and looking up its host fails.
  Always print a newline to stdout when starting.

1 files changed, 5 insertions, 5 deletions

diff --git a/nix-upstream b/nix-upstream
-Subproject 1b6ee8f4c7e74f75e1f49b43cf22be7730b3064
+Subproject bf0ad8aabca67b4faabe3a1ac3c57884ae9924f