[guile-gcrypt] Symmetric Ciphers Module

[Saad Rhoulam]

Hello everyone,

While hoping to make something in Guile that needed symmetric 
encryption, it fell to me to extend guile-gcrypt. Unfortunately, because 
of how some procedures like `gcrypt_cipher_gettag` are implemented, the 
Guile FFI reports that they don't exist! This blocks AEAD, which is what 
I needed, so it's back to the drawing board for me. But, short of AEAD, 
some amount of symmetric cryptographic functionality is accessible from 
Guile, hence the attached patch.

I've left the AEAD-related code commented out in the module in case 
anyone is interested in this challenge.

Regards,

S. Rhoulam
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