gnupg2: bump to version 2.2.4

Add license hash.

Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gnupg2/gnupg2.hash

@@ -1,5 +1,6 @@
-# From https://lists.gnupg.org/pipermail/gnupg-announce/2017q4/000417.html
-sha1 68ed37d363166b5bd79971537484148eb8f2958c  gnupg-2.2.3.tar.bz2
+# From https://lists.gnupg.org/pipermail/gnupg-announce/2017q4/000419.html
+sha1 732266e8888c6f41c084d043c7a0058332ff3580  gnupg-2.2.4.tar.bz2
 # Calculated based on the hash above and signature
-# https://gnupg.org/ftp/gcrypt/gnupg/gnupg-2.2.3.tar.bz2.sig
-sha256 cbd37105d139f7aa74f92b6f65d136658682094b0e308666b820ae4b984084b4  gnupg-2.2.3.tar.bz2
+# https://gnupg.org/ftp/gcrypt/gnupg/gnupg-2.2.4.tar.bz2.sig
+sha256 401a3e64780fdfa6d7670de0880aa5c9d589b3db7a7098979d7606cec546f2ec  gnupg-2.2.4.tar.bz2
+sha256 bc2d6664f6276fa0a72d57633b3ae68dc7dcb677b71018bf08c8e93e509f1357  COPYING

package/gnupg2/gnupg2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GNUPG2_VERSION = 2.2.3
+GNUPG2_VERSION = 2.2.4
 GNUPG2_SOURCE = gnupg-$(GNUPG2_VERSION).tar.bz2
 GNUPG2_SITE = https://gnupg.org/ftp/gcrypt/gnupg
 GNUPG2_LICENSE = GPL-3.0+