[xmlsec] GOST 28147-89 CFB && padding issue

[Nikolay Shaplov]

I've succsessuflly implemented GOST 28147-89 symmetric transform. You can see 
alpha version of a patch.

I think i will add cfb suffix to all transform names, as gost98 works by default 
in cfb mode. And this mode is recommended. (cbc even has only custom 
implementation as it is out of standard)

I also met an issue I'd like to discuss...

cfb mode do not need padding. And for AES and DES encryption some strange 
efforts are made in openssl/ciphers.c in functions

xmlSecOpenSSLEvpBlockCipherCtxUpdate
xmlSecOpenSSLEvpBlockCipherCtxFinal

So I've wrapped all padding code in 

if ((xmlSecKeyDataId*) ctx->keyId != (xmlSecKeyDataId*) 
xmlSecOpenSSLKeyDataGost28147_89Id)

and everything work well now.

I am not sure that it is the best way to do the trick... 
If this way is good enough I will indent code in proper way there. If not, 
tell me what way to use...
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