libgcrypt: security bump to version 1.7.7

Fix possible timing attack on EdDSA session key.

https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000406.html

Add upstream provided SHA1 hash.

Switch to https download for better corporate firewall compatibility.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgcrypt/libgcrypt.hash

@@ -1,2 +1,4 @@
+# From https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000406.html
+sha1  ea4ae1a4dba51f15095319419d7b42a0bf160384  libgcrypt-1.7.7.tar.bz2
 # Locally calculated
-sha256  626aafee84af9d2ce253d2c143dc1c0902dda045780cc241f39970fc60be05bc  libgcrypt-1.7.6.tar.bz2
+sha256  b9b85eba0793ea3e6e66b896eb031fa05e1a4517277cc9ab10816b359254cd9a  libgcrypt-1.7.7.tar.bz2

package/libgcrypt/libgcrypt.mk

@@ -4,11 +4,11 @@
 #
 ################################################################################
 
-LIBGCRYPT_VERSION = 1.7.6
+LIBGCRYPT_VERSION = 1.7.7
 LIBGCRYPT_SOURCE = libgcrypt-$(LIBGCRYPT_VERSION).tar.bz2
 LIBGCRYPT_LICENSE = LGPL-2.1+
 LIBGCRYPT_LICENSE_FILES = COPYING.LIB
-LIBGCRYPT_SITE = ftp://ftp.gnupg.org/gcrypt/libgcrypt
+LIBGCRYPT_SITE = https://gnupg.org/ftp/gcrypt/libgcrypt
 LIBGCRYPT_INSTALL_STAGING = YES
 LIBGCRYPT_DEPENDENCIES = libgpg-error
 LIBGCRYPT_CONFIG_SCRIPTS = libgcrypt-config