zerotier: update to release 1.4.4

Also allow path to local.conf to be set and enable linker optimisations
to save a few bytes.

Signed-off-by: Moritz Warning <moritzwarning@web.de>

net/zerotier/files/etc/config/zerotier

@@ -7,6 +7,9 @@ config zerotier sample_config
 
 	#option port '9993'
 
+	# path to the local.conf
+	#option local_conf '/etc/zerotier.conf'
+
 	# Generate secret on first start
 	option secret ''
 

net/zerotier/files/etc/init.d/zerotier

@@ -14,7 +14,7 @@ section_enabled() {
 
 start_instance() {
 	local cfg="$1"
-	local port secret config_path path
+	local port secret config_path local_conf path
 	local args=""
 
 	if ! section_enabled "$cfg"; then
@@ -25,6 +25,7 @@ start_instance() {
 	config_get config_path $cfg 'config_path'
 	config_get port $cfg 'port'
 	config_get secret $cfg 'secret'
+	config_get local_conf $cfg 'local_conf'
 
 	path=${CONFIG_PATH}_$cfg
 
@@ -71,6 +72,10 @@ start_instance() {
 		rm -f $path/identity.public
 	fi
 
+	if [ -f "$local_conf" ]; then
+		ln -s "$local_conf" $path/local.conf
+	fi
+
 	add_join() {
 		# an (empty) config file will cause ZT to join a network
 		touch $path/networks.d/$1.conf