package/mosquitto: bump to v1.6.3

Drop dependency on libuuid as it got removed in v1.6.  From ChangeLog.txt:

1.6 - 20190417
==============
- Improved general support for broker generated client ids. Removed libuuid
  dependency.

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
[Peter: explain why libuuid isn't needed any more]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mosquitto/mosquitto.hash

@@ -1,5 +1,5 @@
 # Locally calculated after checking gpg signature
-sha256 78d7e70c3794dc3a1d484b4f2f8d3addebe9c2da3f5a1cebe557f7d13beb0da4  mosquitto-1.5.8.tar.gz
+sha256 9ef5cc75f4fe31d7bf50654ddf4728ad9e1ae2e5609a4b42ecbbcb4a209ed17e  mosquitto-1.6.3.tar.gz
 
 # License files
 sha256 cc77e25bafd40637b7084f04086d606f0a200051b61806f97c93405926670bc1  LICENSE.txt

package/mosquitto/mosquitto.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MOSQUITTO_VERSION = 1.5.8
+MOSQUITTO_VERSION = 1.6.3
 MOSQUITTO_SITE = https://mosquitto.org/files/source
 MOSQUITTO_LICENSE = EPL-1.0 or EDLv1.0
 MOSQUITTO_LICENSE_FILES = LICENSE.txt epl-v10 edl-v10
@@ -44,13 +44,6 @@ else
 MOSQUITTO_MAKE_OPTS += WITH_SRV=no
 endif
 
-ifeq ($(BR2_PACKAGE_UTIL_LINUX_LIBUUID),y)
-MOSQUITTO_DEPENDENCIES += util-linux
-MOSQUITTO_MAKE_OPTS += WITH_UUID=yes
-else
-MOSQUITTO_MAKE_OPTS += WITH_UUID=no
-endif
-
 ifeq ($(BR2_PACKAGE_LIBWEBSOCKETS),y)
 MOSQUITTO_DEPENDENCIES += libwebsockets
 MOSQUITTO_MAKE_OPTS += WITH_WEBSOCKETS=yes