branch master updated (3cd1aaf -> 68a5877)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  3cd1aaf   gnu: parallel: Update to 20180622.
       new  1f1d76a   build-self: Avoid recompilations of 
'compute-guix-derivation'.
       new  68a5877   system: Mapped devices needed for boot do not yield 
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The 2 revisions listed above as "new" are entirely new to this
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listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 build-aux/build-self.scm | 17 +++++++++--------
 gnu/system.scm           | 34 +++++++++++++++++++---------------
 tests/system.scm         | 23 +++++++++++++++++++++++
 3 files changed, 51 insertions(+), 23 deletions(-)