libgcrypt: security bump to version 1.7.8

>From the NEWS file:

- Mitigate a flush+reload side-channel attack on RSA secret keys
  dubbed "Sliding right into disaster".  For details see
  <https://eprint.iacr.org/2017/627>.  [CVE-2017-7526]

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libgcrypt/libgcrypt.hash

@@ -1,4 +1,5 @@
-# From https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000406.html
-sha1  ea4ae1a4dba51f15095319419d7b42a0bf160384  libgcrypt-1.7.7.tar.bz2
-# Locally calculated
-sha256  b9b85eba0793ea3e6e66b896eb031fa05e1a4517277cc9ab10816b359254cd9a  libgcrypt-1.7.7.tar.bz2
+# From https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.html
+sha1  65a4a495aa858483e66868199eaa8238572ca6cd  libgcrypt-1.7.8.tar.bz2
+# Locally calculated after checking signature
+# https://gnupg.org/ftp/gcrypt/libgcrypt/libgcrypt-1.7.8.tar.bz2.sig
+sha256  948276ea47e6ba0244f36a17b51dcdd52cfd1e664b0a1ac3bc82134fb6cec199  libgcrypt-1.7.8.tar.bz2

package/libgcrypt/libgcrypt.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGCRYPT_VERSION = 1.7.7
+LIBGCRYPT_VERSION = 1.7.8
 LIBGCRYPT_SOURCE = libgcrypt-$(LIBGCRYPT_VERSION).tar.bz2
 LIBGCRYPT_LICENSE = LGPL-2.1+
 LIBGCRYPT_LICENSE_FILES = COPYING.LIB