Backported and update the libtasn1 package.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
gnutls: Added configuration option to use external libtasn1

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Added p11-kit

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
gnutls: Allow enabling smart card support as option.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>