[xmlsec] xmlSecMSCryptoX509StoreConstructCertsChain

[Wouter Ketting]

> My fault. I've replaced DSA with GOST2001 in some places so dsa-related
> tests failed. Now only Hmac tests fail both in original and patched code.
> 
> What should I do to make hmac tests pass?

Implement hmac for mscrypto, since it was never implemented before... :)
There is little support of mscrypto api for hmac protocols as far as I 
know.

Wouter