branch core-updates updated (557b555 -> 98bd851)

[Ludovic Courtès]

civodul pushed a change to branch core-updates
in repository guix.

      from  557b555   gnu: commencement: Restrict allowed references for 
libstdc++.
       new  52cfd8c   gnu: gcc-final: Remove unnecessary CPPFLAGS.
       new  98bd851   gnu: gcc: Use the system zlib.

The 2 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 gnu/packages/commencement.scm |   55 +++++++++++++++++++++++++---------------
 gnu/packages/gcc.scm          |    1 +
 2 files changed, 35 insertions(+), 21 deletions(-)