gnu: gnutls: Update to 3.2.20--this fixes CVE-2014-8564.

* gnu/packages/patches/gnutls-server-name-fix.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.
* gnu/packages/gnutls.scm (gnutls): Update to 3.2.20.
  Remove 'patches' field.

gnu-system.am

@@ -353,7 +353,6 @@ dist_patch_DATA =						\
   gnu/packages/patches/glibc-ldd-x86_64.patch			\
   gnu/packages/patches/gnunet-fix-scheduler.patch		\
   gnu/packages/patches/gnunet-fix-tests.patch    		\
-  gnu/packages/patches/gnutls-server-name-fix.patch		\
   gnu/packages/patches/gobject-introspection-cc.patch		\
   gnu/packages/patches/grub-gets-undeclared.patch		\
   gnu/packages/patches/gstreamer-0.10-bison3.patch		\

gnu/packages/gnutls.scm

@@ -63,7 +63,7 @@ specifications.")
 (define-public gnutls
   (package
     (name "gnutls")
-    (version "3.2.19")
+    (version "3.2.20")
     (source (origin
              (method url-fetch)
              (uri
@@ -74,8 +74,7 @@ specifications.")
                              "/gnutls-" version ".tar.xz"))
              (sha256
               (base32
-               "1krx33ab2ijwfz71f1ba8labxfsic7jhlhv6rvjsyw566jj9a3d2"))
+               "165mpmm506jgpiffgf0s01rrn8c14qkan1saaa79dvf3g1z0arvr"))))
-             (patches (list (search-patch "gnutls-server-name-fix.patch")))))
     (build-system gnu-build-system)
     (arguments
      '(#:configure-flags

gnu/packages/patches/gnutls-server-name-fix.patch

@@ -1,17 +0,0 @@
-Fix a typo introduced in the first series implementing
-'set-session-server-name!' whereby the trailing nul character would
-be passed on the wire, thereby breaking connections.
-
-diff --git a/guile/src/core.c b/guile/src/core.c
-index 82fd573..2778205 100644
---- a/guile/src/core.c
-+++ b/guile/src/core.c
-@@ -719,7 +719,7 @@ SCM_DEFINE (scm_gnutls_set_session_server_name_x, "set-session-server-name!",
-   c_name = scm_to_locale_string (name);
- 
-   err = gnutls_server_name_set (c_session, c_type, c_name,
--				strlen (c_name) + 1);
-+				strlen (c_name));
-   free (c_name);
- 
-   if (EXPECT_FALSE (err != GNUTLS_E_SUCCESS))