Make it possible so that libpurple plugins can use functions defined in libpurple/glibcompat.h

Testing Done:
Compiled on linux and raspberry pi os which fixes that build.

Reviewed at
* purple
* Purple is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
# error "only <purple.h> may be included directly"
#ifndef PURPLE_GIO_H
#define PURPLE_GIO_H
* SECTION:purple-gio
* @section_id: libpurple-purple-gio
* @short_description: Gio helper functions
* @title: Purple Gio API
* The Purple Gio API provides helper functions for Gio operations which
* are commonly used within libpurple and its consumers. These contain
* such functions as setting up connections and shutting them down
* gracefully.
#include "account.h"
#include <gio/gio.h>
* purple_gio_graceful_close:
* @stream: A #GIOStream to close
* @input: (nullable): A #GInputStream which wraps @stream's input stream
* @output: (nullable): A #GOutputStream which wraps @stream's output stream
* Closes @input, @output, @stream. If there are pending operations, it
* asynchronously waits for the operations to finish before closing the
* arguments. Ensure the Gio callbacks can safely handle this being done
* asynchronously.
purple_gio_graceful_close(GIOStream *stream,
GInputStream *input, GOutputStream *output);
* purple_gio_socket_client_new:
* @account: The #PurpleAccount to use for this connection
* @error: Return location for a GError, or NULL
* A helper function to simplify creating a #GSocketClient. It's intended
* to be used in protocol plugins.
* Returns: (transfer full): A new #GSocketClient with the appropriate
* GProxyResolver, based on the #PurpleAccount settings and
* TLS Certificate handling, or NULL if an error occurred.
GSocketClient *
purple_gio_socket_client_new(PurpleAccount *account, GError **error);
* purple_socket_listener_add_any_inet_port:
* @listener: A #GSocketListener.
* @source_object: (nullable): Optional GObject identifying this source.
* @error: A #GError location to store the error occurring, or %NULL to ignore.
* Listens for TCP connections on any available port number for both IPv6 and
* IPv4 (if each is available). This is a simple wrapper around
* g_socket_listener_add_any_inet_port(), except if the user specified a port
* range in the settings, than a port will be chosen from that range.
* Returns: The port number, or 0 in case of failure.
guint16 purple_socket_listener_add_any_inet_port(GSocketListener *listener,
GObject *source_object,
GError **error);
#endif /* PURPLE_GIO_H */