gnu: coreutils: Use upstream's fix for 'tail'.

* gnu/packages/patches/coreutils-racy-tail-test.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.
* gnu/packages/base.scm (coreutils)[source]: Replace this patch with
  upstream's fix for 'tail'.

gnu-system.am

@@ -418,7 +418,6 @@ dist_patch_DATA =						\
   gnu/packages/patches/clang-libc-search-path.patch		\
   gnu/packages/patches/clucene-pkgconfig.patch			\
   gnu/packages/patches/cmake-fix-tests.patch			\
-  gnu/packages/patches/coreutils-racy-tail-test.patch		\
   gnu/packages/patches/cpio-gets-undeclared.patch		\
   gnu/packages/patches/cpufrequtils-fix-aclocal.patch		\
   gnu/packages/patches/crda-optional-gcrypt.patch		\

gnu/packages/base.scm

@@ -251,7 +251,14 @@ used to apply commands with arbitrarily long arguments.")
              (base32
               "0w11jw3fb5sslf0f72kxy7llxgk1ia3a6bcw0c9kmvxrlj355mx2"))
             (patches
-             (list (search-patch "coreutils-racy-tail-test.patch")))))
+             (list (origin
+                     (method url-fetch)
+                     (uri "http://git.savannah.gnu.org/cgit/coreutils.git/\
+patch/?id=3ba68f9e64fa2eb8af22d510437a0c6441feb5e0")
+                     (sha256
+                      (base32
+                       "1dnlszhc8lihhg801i9sz896mlrgfsjfcz62636prb27k5hmixqz"))
+                     (file-name "coreutils-tail-inotify-race.patch"))))))
    (build-system gnu-build-system)
    (inputs `(("acl"  ,acl)                        ; TODO: add SELinux
              ("gmp"  ,gmp)                        ;bignums in 'expr', yay!

gnu/packages/patches/coreutils-racy-tail-test.patch

@@ -1,13 +0,0 @@
-Skip this test, which uncovers a race condition in how 'tail' handles
-file deletion.  See <http://bugs.gnu.org/21460>.
-
---- a/tests/tail-2/assert.sh
-+++ b/tests/tail-2/assert.sh
-@@ -16,6 +16,7 @@
- # You should have received a copy of the GNU General Public License
- # along with this program.  If not, see <http://www.gnu.org/licenses/>.
- 
-+exit 77				# see <http://bugs.gnu.org/21460>
- 
- # This test fails with tail from textutils-2.0.
- # It would get something like this: