gthreadedresolver: Move private testing symbols to a private header

The symbols still have to be exported from the library (since they’re
called from unit tests), but there was never any reason for them to be
in a public header.

This means they now disappear from `Gio-2.0.gir`.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Helps: #3231

fuzzing/fuzz_resolver.c

@@ -21,6 +21,7 @@
 #include "gio/gnetworking.h"
 
 #include "../gio/gthreadedresolver.h"
+#include "../gio/gthreadedresolver-private.h"
 
 static void
 test_for_rrtype (const guint8 *data,

gio/gthreadedresolver-private.h

@@ -0,0 +1,46 @@
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __G_THREADED_RESOLVER_PRIVATE_H__
+#define __G_THREADED_RESOLVER_PRIVATE_H__
+
+#include <gio/gio.h>
+#include <gio/gresolver.h>
+
+G_BEGIN_DECLS
+
+/* Used for a private test API */
+#ifdef G_OS_UNIX
+/*< private >*/
+GIO_AVAILABLE_IN_ALL
+GList *g_resolver_records_from_res_query (const gchar      *rrname,
+                                          gint              rrtype,
+                                          const guint8     *answer,
+                                          gssize            len,
+                                          gint              herr,
+                                          GError          **error);
+/*< private >*/
+GIO_AVAILABLE_IN_ALL
+gint g_resolver_record_type_to_rrtype (GResolverRecordType type);
+#endif
+
+G_END_DECLS
+
+#endif /* __G_RESOLVER_PRIVATE_H__ */

gio/gthreadedresolver.c

@@ -30,6 +30,7 @@
 
 #include "glib/glib-private.h"
 #include "gthreadedresolver.h"
+#include "gthreadedresolver-private.h"
 #include "gnetworkingprivate.h"
 
 #include "gcancellable.h"

gio/gthreadedresolver.h

@@ -39,21 +39,6 @@ G_BEGIN_DECLS
 GIO_AVAILABLE_IN_ALL
 G_DECLARE_FINAL_TYPE (GThreadedResolver, g_threaded_resolver, G, THREADED_RESOLVER, GResolver)
 
-/* Used for a private test API */
-#ifdef G_OS_UNIX
-/*< private >*/
-GIO_AVAILABLE_IN_ALL
-GList *g_resolver_records_from_res_query (const gchar      *rrname,
-                                          gint              rrtype,
-                                          const guint8     *answer,
-                                          gssize            len,
-                                          gint              herr,
-                                          GError          **error);
-/*< private >*/
-GIO_AVAILABLE_IN_ALL
-gint g_resolver_record_type_to_rrtype (GResolverRecordType type);
-#endif
-
 G_END_DECLS
 
 #endif /* __G_RESOLVER_H__ */

gio/tests/resolver-parsing.c

@@ -26,6 +26,7 @@
 
 #define GIO_COMPILATION
 #include "gthreadedresolver.h"
+#include "gthreadedresolver-private.h"
 #undef GIO_COMPILATION
 
 #ifdef HAVE_DN_COMP