cpp: Include <vector> to show MSVC compilation error
This is related to misuse of `std::swap<evmc_result>`. We should not use explicit template arguments, because this disabled SFINAE and forces instantiation of all overloads.
// Copyright 2018-2019 The EVMC Authors.
// Licensed under the Apache License, Version 2.0.
+// The vector is not used here, but including it was causing compilation issues
+// previously related to using explicit template argument (SFINAE disabled).
+#include <vector>
+
#include "../../examples/example_host.h"
#include "../../examples/example_vm.h"
