branch security-updates created (now 9f865b3)

[Efraim Flashner]

efraim pushed a change to branch security-updates
in repository guix.

        at  9f865b3   gnu: at-spi2-core: Update to 2.18.3.

This branch includes the following new commits:

       new  ec25483   gnu: cups-filters: Update to 1.4.0. (fixes CVE-2015-8560)
       new  fec33fb   gnu: cups: Update to 2.1.2.
       new  78311c8   gnu: gtk+: Update to 3.18.6.
       new  9f865b3   gnu: at-spi2-core: Update to 2.18.3.

The 4 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.