There is an issue where an optimised OpenSSL function causes a buffer overrun in 64-bit Windows builds and terminates the process (this is why the buildbots aren't getting very far right now).

I suspect it may be a compiler issue, but for now I'm disabling the optimised function. This issue is a reminder to myself to re-enable the function when we have a fix. I'll follow up with the compiler team and possibly the OpenSSL team separately.