Interim patch for OpenWRT dnsmasq addnmount v22.03 backport

v22.03-dnsmasq-addnmount.patch

diff --git a/dhcp.conf b/dhcp.conf
index 8c42ef782e..87fe45a7e0 100644
--- a/dhcp.conf
+++ b/dhcp.conf
@@ -21,6 +21,7 @@ config dnsmasq
 	#list bogusnxdomain     '64.94.110.11'
 	option localservice	1  # disable to allow DNS requests from non-local subnets
 	option ednspacket_max	1232
+	#list addnmount		/some/path # read-only mount path to expose it to dnsmasq
 
 config dhcp lan
 	option interface	lan
diff --git a/dnsmasq.init b/dnsmasq.init
index c4ca3eb2db..e64f05df70 100755
--- a/dnsmasq.init
+++ b/dnsmasq.init
@@ -205,8 +205,12 @@ ismounted() {
 	return 1
 }
 
-append_addnhosts() {
+append_extramount() {
 	ismounted "$1" || append EXTRA_MOUNT "$1"
+}
+
+append_addnhosts() {
+	append_extramount "$1"
 	xappend "--addn-hosts=$1"
 }
 
@@ -1157,6 +1161,8 @@ dnsmasq_start()
 		done
 	}
 
+	config_list_foreach "$cfg" addnmount append_extramount
+
 	procd_open_instance $cfg
 	procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq."${cfg}".pid
 	procd_set_param file $CONFIGFILE