Re: (ITS#7877) please make gcrypt optional with newer gnutls

[ryan@nardis.ca]

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And here are the changes for smbk5pwd. Tried to use gnutls' own api
since it abstracts gcrypt/nettle, but sadly it doesn't provide md4, so
nettle it is.

Note this patch assumes the HAVE_GNUTLS_GCRYPT define from the
configure addition in the previous patch.

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