Update upstream Nix sub-module.

* nix-upstream: Update. * NEWS: Mention multiple-derivation output bug.
7 years ago · 16357e8c71
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 *** Binary substituter gracefully handles lack of network connectivity

 *** Daemon properly handles rebuilds of multiple-output derivations

 Previously it would fail when rebuilding a multiple-output derivation when
 some (but not all) of its outputs were already present.  See
 http://lists.gnu.org/archive/html/bug-guix/2013-06/msg00038.html and
 https://github.com/NixOS/nix/issues/122 .

 * Changes in 0.2 (since 0.1)

 ** Package management
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 Subproject commit 3a0cc43ac89ae8f778764c9f5e27b361e4986913
 Subproject commit 1b6ee8f4c7e74f75e1f49b43cf22be7730b30649