io.sockets: make addrspecs immutable

basis/io/sockets/secure/secure.factor

@@ -39,7 +39,7 @@ HOOK: <secure-context> secure-socket-backend ( config -- context )
         with-disposal
     ] with-scope ; inline
 
-TUPLE: secure addrspec ;
+TUPLE: secure { addrspec read-only } ;
 
 C: <secure> secure
 

basis/io/sockets/sockets.factor

@@ -51,7 +51,7 @@ HOOK: addrspec-of-family os ( af -- addrspec )
 
 PRIVATE>
 
-TUPLE: local path ;
+TUPLE: local { path read-only } ;
 
 : <local> ( path -- addrspec )
     normalize-path local boa ;