[xmlsec] Implementing GOST algorythm support

[Dmitry Belyavsky]

Hello!

I'm going to add support for our library which implements russian GOST
crypto-algorythms.

Looking through definition of xmlSecCryptoDLFunctions struct I found out
that well-known crypto transforms have a particular fields of type
xmlSecCryptoTransformGetKlassMethod. Should I provide such fields for key
data ids and crypto transforms ids and (may be) key data store ids or
there is a better way?

-- 
SY, Dmitry Belyavsky (ICQ UIN 11116575)