cipher: Add support for 128-bit keys in RC2
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cipher: Add support for 128-bit keys in RC2

* cipher/rfc2268.c (oids_rfc2268_128): New
(_gcry_cipher_spec_rfc2268_128): New.
* cipher/cipher.c (cipher_table_entry): Add GCRY_CIPHER_RFC2268_128.

This patch adds support for decrypting (and encrypting) using 128-bit
keys using the RC2 algorithm.

Actually this is merely enabling that extra ID for 128 bit RFC2268.
We should have used one id for that algorithm only, because a second
identifier merely for having the OID in the code is a bad idea. My
initial fault and thus I better apply this patch to make the id not
entirely useless. -wk