Fix includes in source/network

Make include-what-you-use happy with files in source/network and
fix what needs to be fixed.

Ref: #8086
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

source/network/NetFileTransfer.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2024 Wildfire Games.
+/* Copyright (C) 2025 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -20,10 +20,16 @@
 #include "NetFileTransfer.h"
 
 #include "lib/alignment.h"
+#include "lib/posix/posix_types.h"
 #include "lib/timer.h"
 #include "network/NetMessage.h"
 #include "network/NetSession.h"
 #include "ps/CLogger.h"
+#include "ps/CStr.h"
+
+#include <algorithm>
+#include <memory>
+#include <new>
 
 Status CNetFileTransferer::HandleMessageReceive(const CNetMessage& message)
 {