Change calling CreateThread to _beginthreadex for Windows

[Ziglag]

Runtime/Private/Windows/System.cpp:

    void* CreateThread(Runtime::Parallel::ThreadOptionsHelper& refThreadOptions)
    {
        return ::CreateThread(nullptr, static_cast<SIZE_T>(refThreadOptions.stackSize), refThreadOptions.startAddress,
                              refThreadOptions.paramsAddress,
                              refThreadOptions.isSuspendedOnStart ? CREATE_SUSPENDED : 0, &refThreadOptions.threadId);
    }

Replace CreateThread with _beginthreadex