libgcrypt: security bump to version 1.6.3

Fixes:
CVE-2014-3591 - Use ciphertext blinding for Elgamal decryption
CVE-2015-0837 - Fixed data-dependent timing variations in modular
exponentiation.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgcrypt/libgcrypt.hash

@@ -1,2 +1,2 @@
-# From http://lists.gnupg.org/pipermail/gnupg-announce/2014q3/000355.html
-sha1	cc31aca87e4a3769cb86884a3f5982b2cc8eb7ec	libgcrypt-1.6.2.tar.bz2
+# From http://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html
+sha1	9456e7b64db9df8360a1407a38c8c958da80bbf1	libgcrypt-1.6.3.tar.bz2

package/libgcrypt/libgcrypt.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGCRYPT_VERSION = 1.6.2
+LIBGCRYPT_VERSION = 1.6.3
 LIBGCRYPT_SOURCE = libgcrypt-$(LIBGCRYPT_VERSION).tar.bz2
 LIBGCRYPT_LICENSE = LGPLv2.1+
 LIBGCRYPT_LICENSE_FILES = COPYING.LIB