Log Message:
Updated libtasn1 to 4.8. Security update.

* Noteworthy changes in release 4.8 (released 2016-04-11) [stable]
- Fixes to avoid reliance on C undefined behavior.
- Fixes to avoid an infinite recursion when decoding without
  the ASN1_DECODE_FLAG_STRICT_DER flag. Reported by Pascal Cuoq.
- Combined all the BER octet string decoding functions to a single
  one based on asn1_decode_simple_ber().

* Noteworthy changes in release 4.7 (released 2015-09-14) [stable]
- Fixed regression introduced in the decoding of multi-byte tags
  fix.

* Noteworthy changes in release 4.6 (released 2015-09-05) [stable]
- Allow decoding OCTET STRINGs with multi-byte tags.
- API and ABI changes since last version:
  asn1_get_object_id_der: New function