gnu: glibc: Add fix for CVE-2015-7547.

* gnu/packages/patches/glibc-CVE-2015-7547.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/base.scm (glibc)[source]: Add patch.

gnu-system.am

@@ -491,6 +491,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/glib-tests-prlimit.patch			\
   gnu/packages/patches/glib-tests-timer.patch			\
   gnu/packages/patches/glib-tests-gapplication.patch		\
+  gnu/packages/patches/glibc-CVE-2015-7547.patch		\
   gnu/packages/patches/glibc-bootstrap-system.patch		\
   gnu/packages/patches/glibc-hurd-extern-inline.patch		\
   gnu/packages/patches/glibc-ldd-x86_64.patch			\

gnu/packages/base.scm

@@ -2,7 +2,7 @@
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2012 Nikita Karetnikov <nikita@karetnikov.org>
-;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2014, 2015, 2016 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2014, 2015 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
 ;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
@@ -488,7 +488,8 @@ (define-public glibc
                           '("glibc-ldd-x86_64.patch"
                             "glibc-locale-incompatibility.patch"
                             "glibc-versioned-locpath.patch"
-                            "glibc-o-largefile.patch")))))
+                            "glibc-o-largefile.patch"
+                            "glibc-CVE-2015-7547.patch")))))
    (build-system gnu-build-system)
 
    ;; Glibc's <limits.h> refers to <linux/limit.h>, for instance, so glibc