agent: Allow key unprotection using AES-256.
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Description

agent: Allow key unprotection using AES-256.

* agent/protect.c (PROT_CIPHER): Rename to GCRY_CIPHER_AES128 for
clarity.
(do_decryption): Add args prot_cipher and prot_cipher_keylen.  USe
them instead of the hardwired values.
(agent_unprotect): Change to use a table of protection algorithms.
Add AES-256 variant.

This patch will make a possible future key protection algorithm
changes smoother. AES-256 is also allowed although there is currently
no way to encrypt using it.