Fix one of the compiler errors

Author: Sectonid

public/tier1/convar.h

@@ -1,4 +1,4 @@
-//===== Copyright © 1996-2005, Valve Corporation, All rights reserved. ======//
+//===== Copyright © 1996-2005, Valve Corporation, All rights reserved. ======//
 //
 // Purpose: 
 //
@@ -16,6 +16,9 @@
 #pragma once
 #endif
 
+// This is for fixing "error LNK2019: unresolved external symbol _sscanf referenced in ConVar::InternalSetColorFromString"
+#pragma comment (lib, "legacy_stdio_definitions.lib")
+
 #include "tier0/dbg.h"
 #include "tier1/iconvar.h"
 #include "tier1/utlvector.h"