mosquitto: bump to v1.5.8

Full changelog available at:
https://github.com/eclipse/mosquitto/blob/v1.5.8/ChangeLog.txt

This is a bugfix release.  Of likely note to OpenWrt is a bug affecting
missing messages on bridges since 1.5.4:
https://github.com/eclipse/mosquitto/issues/1174

Signed-off-by: Karl Palsson <karlp@etactica.com>

net/mosquitto/Makefile

@@ -9,7 +9,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mosquitto
-PKG_VERSION:=1.5.7
+PKG_VERSION:=1.5.8
 PKG_RELEASE:=1
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE.txt
@@ -17,7 +17,7 @@ PKG_CPE_ID:=cpe:/a:eclipse:mosquitto
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://mosquitto.org/files/source/
-PKG_HASH:=d4024c3388502d50be4192991e90d66dfb344376104df3f63846c9f201779955
+PKG_HASH:=78d7e70c3794dc3a1d484b4f2f8d3addebe9c2da3f5a1cebe557f7d13beb0da4
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)
 
 include $(INCLUDE_DIR)/package.mk