stunnel: bump to version 5.21

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/stunnel/stunnel.hash

@@ -1,2 +1,2 @@
-# From http://www.stunnel.org/pipermail/stunnel-users/2015-June/005094.html
-sha256	0532c0a2f8de3da1ab625e384146501ce5936fac63d01561c3a9bf652b692317	stunnel-5.18.tar.gz
+# From http://www.stunnel.org/pipermail/stunnel-users/2015-July/005180.html
+sha256	2aef568b1955f5e233f6a8e17ebce3d30755f1be44c813f5a48e621f785596e3	stunnel-5.21.tar.gz

package/stunnel/stunnel.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 STUNNEL_VERSION_MAJOR = 5
-STUNNEL_VERSION = $(STUNNEL_VERSION_MAJOR).18
+STUNNEL_VERSION = $(STUNNEL_VERSION_MAJOR).21
 STUNNEL_SITE = http://www.usenix.org.uk/mirrors/stunnel/archive/$(STUNNEL_VERSION_MAJOR).x
 STUNNEL_DEPENDENCIES = openssl
 STUNNEL_CONF_OPTS = --with-ssl=$(STAGING_DIR)/usr --with-threads=fork \