winapi: Implement SecureZeroMemory() #690
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The latest mbedtls release depends on this, and it was easy to implement.
It's basically just like a memset with zeroes or a call to ZeroMemory, but with volatile pointers to keep the compiler from optimizing it out, so it can be used for clearing memory that contained sensitive data.
On Windows this is implement in a header so the compiler can inline it, I did that as well.