[gnutls-devel] Various fixes for hex DN attributes

[Stef Walter]

The encoding of unrecognized (or non-string) DN attributes via functions
like gnutls_x509_crt_get_dn() doesn't work properly. The function
returns GNUTLS_E_ASN1_DER_ERROR. Attached are a number of patches and
some test code to demonstrate the problem and fix related things.

Cheers,

Stef
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