Add API to GLFW for user notifications using DBus

glfw/linux_notify.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2019 Kovid Goyal <kovid at kovidgoyal.net>
+ *
+ * Distributed under terms of the GPL3 license.
+ */
+
+#pragma once
+
+
+#include "dbus_glfw.h"
+
+typedef unsigned long long notification_id_type;
+typedef void (*GLFWDBusnotificationcreatedfun)(notification_id_type, uint32_t, void*);
+notification_id_type
+glfw_dbus_send_user_notification(const char *app_name, const char* icon, const char *summary, const char *body, int32_t timeout, GLFWDBusnotificationcreatedfun, void*);