libgcrypt: bump version to 1.6.4

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libgcrypt/libgcrypt.hash

@@ -1,2 +1,2 @@
-# From http://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html
-sha1	9456e7b64db9df8360a1407a38c8c958da80bbf1	libgcrypt-1.6.3.tar.bz2
+# From https://lists.gnu.org/archive/html/info-gnu/2015-09/msg00000.html
+sha1 ed52add1ce635deeb2f5c6650e52667debd4ec70  libgcrypt-1.6.4.tar.bz2

package/libgcrypt/libgcrypt.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGCRYPT_VERSION = 1.6.3
+LIBGCRYPT_VERSION = 1.6.4
 LIBGCRYPT_SOURCE = libgcrypt-$(LIBGCRYPT_VERSION).tar.bz2
 LIBGCRYPT_LICENSE = LGPLv2.1+
 LIBGCRYPT_LICENSE_FILES = COPYING.LIB