Updated gnutls to 3.5.13.

While here, remove empty line from PLIST.

* Version 3.5.13 (released 2017-06-07)

** libgnutls: fixed issue with AES-GCM in-place encryption and decryption in
  aarch64. Resolves gitlab issue #204.

** libgnutls: no longer parse the ResponseID field of the status response
  TLS extension. The field is not used by GnuTLS nor is made available to
  calling applications. That addresses a null pointer dereference on server
  side caused by packets containing the ResponseID field. Reported
  by Hubert Kario. [GNUTLS-SA-2017-4]

** libgnutls: tolerate certificates which do not have strict DER time encoding.
  It is possible using 3rd party tools to generate certificates with time fields
  that do not conform to DER requirements. Since 3.4.x these certificates were rejected
  and cannot be used with GnuTLS, however that caused problems with existing private
  certificate infrastructures, which were relying on such certificates (see gitlab
  issue #196). Tolerate reading and using these certificates.

** minitasn1: updated to libtasn1 4.11.

** certtool: allow multiple certificates to be used in --p7-sign with
  the --load-certificate option. Patch by Karl Tarbe.

(wiz)