Replace all include guards by #pragma once

It’s $CURRENT_YEAR

src/xmpp/biboumi_adhoc_commands.hpp

@@ -1,5 +1,5 @@
-#ifndef BIBOUMI_ADHOC_COMMANDS_HPP_INCLUDED
-#define BIBOUMI_ADHOC_COMMANDS_HPP_INCLUDED
+#pragma once
+
 
 #include <xmpp/adhoc_command.hpp>
 #include <xmpp/adhoc_session.hpp>
@@ -20,4 +20,4 @@ void DisconnectUserFromServerStep1(XmppComponent&, AdhocSession& session, XmlNod
 void DisconnectUserFromServerStep2(XmppComponent&, AdhocSession& session, XmlNode& command_node);
 void DisconnectUserFromServerStep3(XmppComponent&, AdhocSession& session, XmlNode& command_node);
 
-#endif /* BIBOUMI_ADHOC_COMMANDS_HPP_INCLUDED */
+

src/xmpp/biboumi_component.hpp

@@ -1,5 +1,5 @@
-#ifndef BIBOUMI_COMPONENT_INCLUDED
-# define BIBOUMI_COMPONENT_INCLUDED
+#pragma once
+
 
 #include <xmpp/xmpp_component.hpp>
 
@@ -106,4 +106,4 @@ private:
   AdhocCommandsHandler irc_channel_adhoc_commands_handler;
 };
 
-#endif // BIBOUMI_COMPONENT_INCLUDED
+