Fix #2192 - honor addr%scopeid ipv6 notation

src/net.h

@@ -13,9 +13,10 @@ struct mg_dns {
 };
 
 struct mg_addr {
-  uint8_t ip[16];  // Holds IPv4 or IPv6 address, in network byte order
-  uint16_t port;   // TCP or UDP port in network byte order
-  bool is_ip6;     // True when address is IPv6 address
+  uint8_t ip[16];    // Holds IPv4 or IPv6 address, in network byte order
+  uint16_t port;     // TCP or UDP port in network byte order
+  uint8_t scope_id;  // IPv6 scope ID
+  bool is_ip6;       // True when address is IPv6 address
 };
 
 struct mg_mgr {