Fix windows SEH hook when crashing in an std::thread

Follows 107d3d461f and other 'pthread->std::thread' diffs.

Windows uses Structured Exception Handling to allow reporting errors
(both C++ and hardware) nicely. This works by wrapping the code in a
__try __catch block.
The pthread wrapper did this automatically, but we now need to do it
explicitly for std::thread.

Tested by: Stan
Differential Revision: https://code.wildfiregames.com/D3261
This was SVN commit r24530.

source/network/NetClient.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2020 Wildfire Games.
+/* Copyright (C) 2021 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -34,6 +34,7 @@
 #include "ps/Game.h"
 #include "ps/Loader.h"
 #include "ps/Profile.h"
+#include "ps/Threading.h"
 #include "scriptinterface/ScriptInterface.h"
 #include "simulation2/Simulation2.h"
 
@@ -175,7 +176,7 @@ bool CNetClient::SetupConnection(const CStr& server, const u16 port, ENetHost* e
 	CNetClientSession* session = new CNetClientSession(*this);
 	bool ok = session->Connect(server, port, m_IsLocalClient, enetClient);
 	SetAndOwnSession(session);
-	m_PollingThread = std::thread(CNetClientSession::RunNetLoop, m_Session);
+	m_PollingThread = std::thread(Threading::HandleExceptions<CNetClientSession::RunNetLoop>::Wrapper, m_Session);
 	return ok;
 }