scrypt KDF support for libgcrypt

[Christian Grothoff]

Hi!

I've hacked up an implementation of scrypt for libgcrypt based on 
Simon's scrypt implementation in nettle.  The code compiles on my
system, but is completely untested otherwise.

No test case is included at this point; Simon's internet draft on scrypt 
includes some test vectors that should be used for that eventually).

Anyway, I think this should be a start towards fixing 
https://bugs.g10code.com/gnupg/issue1471

Happy hacking!

Christian
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