contrib: bump gnutls

* bump from 3.4.2 to 3.4.6
* mostly fixes (including security)

Tuleap: #62
Change-Id: Ibe0e44e91f5cc7d9bb102aa9af9fed03c65f5754

contrib/src/gnutls/SHA512SUMS

-4c8c122ee3f189b5bbdb90f0a6b849a332e23c4cb87ba3b51d0672578b6b8e13aeaeacf69f8910a7380bb130dcdfd8d505d88d8358bd6b339e97a187990dbbd4  gnutls-3.4.2.tar.xz
+c81da5bba3b28ab17ef762d8c6a6607745f1fa7177e0fdaacd374ac0ee64c14cd804e048aeb965383fafaa677ba2ed256c709a117f8a95012f8494c650d29c81  gnutls-3.4.6.tar.xz

contrib/src/gnutls/format-security.patch

-diff -rU0 gnutls-old/lib/x509/output.c gnutls/lib/x509/output.c
---- gnutls-old/lib/x509/output.c
-+++ gnutls/lib/x509/output.c
-@@ -1140 +1140 @@
--					addf(str, _("\t\tP: "));
-+					adds(str, _("\t\tP: "));
-@@ -1145 +1145 @@
--					addf(str, _("\t\tQ: "));
-+					adds(str, _("\t\tQ: "));
-@@ -1150 +1150 @@
--					addf(str, _("\t\tG: "));
-+					adds(str, _("\t\tG: "));
 diff -rU0 gnutls-old/lib/x509/ocsp_output.c gnutls/lib/x509/ocsp_output.c
 --- gnutls-old/lib/x509/ocsp_output.c
 +++ gnutls/lib/x509/ocsp_output.c
-@@ -291 +291 @@
+@@ -289 +289 @@
 -					addf(str, _("\tResponder Key ID: "));
 +					adds(str, _("\tResponder Key ID: "));

contrib/src/gnutls/rules.mak

 # GnuTLS
 
-GNUTLS_VERSION := 3.4.2
+GNUTLS_VERSION := 3.4.6
 GNUTLS_URL := ftp://ftp.gnutls.org/gcrypt/gnutls/v3.4/gnutls-$(GNUTLS_VERSION).tar.xz
 
 PKGS += gnutls