Log Message:
Changes 3.2.18:

** libgnutls: Fixes in gnutls_x509_crt_set_dn() and friends to properly handle
strings with embedded spaces and escaped commas.

** libgnutls: Corrected gnutls_x509_crl_verify() which would always report
a CRL signature as invalid.

** libgnutls: Fixed issue with certificates being sanitized by gnutls prior
to signature verification. That resulted to certain non-DER compliant modifications
of valid certificates, being corrected by libtasn1's parser and restructured as
the original.