package/openvpn: security bump to version 2.4.4

Fixes CVE-2017-12166:
https://community.openvpn.net/openvpn/wiki/CVE-2017-12166

Changelog:
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/openvpn/openvpn.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking signature
-sha256 15e15fc97f189b52aee7c90ec8355aa77469c773125110b4c2f089abecde36fb  openvpn-2.4.3.tar.xz
+sha256 96cd1b8fe1e8cb2920f07c3fd3985faea756e16fdeebd11d3e146d5bd2b04a80  openvpn-2.4.4.tar.xz

package/openvpn/openvpn.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-OPENVPN_VERSION = 2.4.3
+OPENVPN_VERSION = 2.4.4
 OPENVPN_SOURCE = openvpn-$(OPENVPN_VERSION).tar.xz
 OPENVPN_SITE = http://swupdate.openvpn.net/community/releases
 OPENVPN_DEPENDENCIES = host-pkgconf openssl