gthreadedresolver: Export g_resolver_records_from_res_query()

While it’s not a supported public part of the API, exporting this
symbol from the library means we can easily test the DNS record parser,
which is important to do since it handles untrusted data from the
network.

gio/gthreadedresolver.c

@@ -652,7 +652,7 @@ g_resolver_record_type_to_rrtype (GResolverRecordType type)
   g_return_val_if_reached (-1);
 }
 
-static GList *
+GList *
 g_resolver_records_from_res_query (const gchar      *rrname,
                                    gint              rrtype,
                                    guchar           *answer,

gio/gthreadedresolver.h

@@ -42,6 +42,15 @@ typedef struct {
 GLIB_AVAILABLE_IN_ALL
 GType g_threaded_resolver_get_type (void) G_GNUC_CONST;
 
+/* Used for a private test API */
+GLIB_AVAILABLE_IN_ALL
+GList *g_resolver_records_from_res_query (const gchar      *rrname,
+                                          gint              rrtype,
+                                          guchar           *answer,
+                                          gint              len,
+                                          gint              herr,
+                                          GError          **error);
+
 G_END_DECLS
 
 #endif /* __G_RESOLVER_H__ */