gnutls: bump version to 3.5.12

For details, see the release notes:

https://lists.gnupg.org/pipermail/gnutls-devel/2017-May/008427.html
https://lists.gnupg.org/pipermail/gnutls-devel/2017-April/008393.html

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gnutls/gnutls.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking pgp signature
-sha256	af443e86ba538d4d3e37c4732c00101a492fe4b56a55f4112ff0ab39dbe6579d	gnutls-3.5.10.tar.xz
+sha256	63cb39a5eaa029381df2e49a74cfb7be89fc4a592445191818ffe1e66bde57cb	gnutls-3.5.12.tar.xz

package/gnutls/gnutls.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 GNUTLS_VERSION_MAJOR = 3.5
-GNUTLS_VERSION = $(GNUTLS_VERSION_MAJOR).10
+GNUTLS_VERSION = $(GNUTLS_VERSION_MAJOR).12
 GNUTLS_SOURCE = gnutls-$(GNUTLS_VERSION).tar.xz
 GNUTLS_SITE = ftp://ftp.gnutls.org/gcrypt/gnutls/v$(GNUTLS_VERSION_MAJOR)
 GNUTLS_LICENSE = LGPL-2.1+ (core library), GPL-3.0+ (gnutls-openssl library)