Adding the following syntax support:

config mxhost
        option domain mydomain.com
        option relay svr10.ironport.com
        option pref 50

and this will generate an MX record for mydomain.com pointing at the relay with 
a given preference.

Redux: default the preference to 0 if absent.

Signed-off-by: Philip Prindeville <phil...@redfish-solutions.com>

Index: package/dnsmasq/files/dnsmasq.init
===================================================================
--- package/dnsmasq/files/dnsmasq.init  (revision 30690)
+++ package/dnsmasq/files/dnsmasq.init  (working copy)
@@ -367,6 +367,21 @@
        append args "-W $service"
 }
 
+dhcp_mx_add() {
+       local cfg="$1"
+
+       [ -n "$domain" ] || return 0
+
+       config_get relay "$cfg" relay
+       [ -n "$relay" ] || return 0
+
+       config_get pref "$cfg" pref 0
+
+       local service="$domain,$relay,$pref"
+
+       append args "--mx-host=$service"
+}
+
 dhcp_cname_add() {
        local cfg="$1"
        local cname target
@@ -401,6 +416,7 @@
        config_foreach dhcp_subscrid_add subscrid
        config_foreach dhcp_domain_add domain
        config_foreach dhcp_srv_add srvhost
+       config_foreach dhcp_mx_add mxhost
        config_foreach dhcp_add dhcp
        config_foreach dhcp_cname_add cname
 
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