[PATCH] CFB 8 Bit implementation

[Mathias L. Baumann]

Hello dear Gcrypt Devs,

as a followup to Lizas request/inqueries I now implemented CFB in 8 bit 
mode.

Please let me know about any changes you want to see.

I should add that my stack burning code is more or less just guessing 
how it should be done by imitating what I saw in the other functions.
Please validate that I did that correct :)


The patch is attached and can also found at 
https://github.com/mathias-baumann-sociomantic/libgcrypt/tree/cfb8

cheers,

     --Mathias Baumann
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