Work around G_DEFINE_TYPE -Werror,-Wunused-function

At least G_DEFINE_TYPE from glib2-devel-2.38.2-2.fc20.x86_64
/usr/include/glib-2.0/gobject/gtype.h defines unsed *_get_instance_private
functions.

Change-Id: I47211b6451d9699c7b8741555f3ad11a09e411bf

ucb/source/ucp/gio/gio_mount.cxx

@@ -22,7 +22,14 @@
 #include <stdio.h>
 #include <string.h>
 
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#endif
 G_DEFINE_TYPE (OOoMountOperation, ooo_mount_operation, G_TYPE_MOUNT_OPERATION);
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic pop
+#endif
 
 static void ooo_mount_operation_ask_password (GMountOperation   *op,
     const char *message, const char *default_user, const char *default_domain,

vcl/unx/gtk/window/gloactiongroup.cxx

@@ -40,7 +40,14 @@ struct _GLOAction
 typedef GObjectClass GLOActionClass;
 typedef struct _GLOAction GLOAction;
 
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#endif
 G_DEFINE_TYPE (GLOAction, g_lo_action, G_TYPE_OBJECT);
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic pop
+#endif
 
 GLOAction*
 g_lo_action_new (void)
@@ -100,10 +107,17 @@ struct _GLOActionGroupPrivate
 
 static void g_lo_action_group_iface_init (GActionGroupInterface *);
 
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#endif
 G_DEFINE_TYPE_WITH_CODE (GLOActionGroup,
     g_lo_action_group, G_TYPE_OBJECT,
     G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP,
                            g_lo_action_group_iface_init));
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic pop
+#endif
 
 static gchar **
 g_lo_action_group_list_actions (GActionGroup *group)

vcl/unx/gtk/window/glomenu.cxx

@@ -25,7 +25,14 @@ struct _GLOMenu
 
 typedef GMenuModelClass GLOMenuClass;
 
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#endif
 G_DEFINE_TYPE (GLOMenu, g_lo_menu, G_TYPE_MENU_MODEL);
+#if HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE && HAVE_GCC_PRAGMA_DIAGNOSTIC_MODIFY
+#pragma GCC diagnostic pop
+#endif
 
 struct item
 {