Security update for tboot (important)

This update for tboot fixes the following issues:

Security issues fixed:

• CVE-2017-16837: Fix tbootfailed to validate a number of immutable
  function pointers, which could allow an attacker to bypass the chain of
  trust and execute arbitrary code (boo#1068390).
• Make tboot package compatible with OpenSSL 1.1.0 for SLE-15 support
  (boo#1067229).

Bug fixes:

• Update to new upstream version. See release notes for details (1.9.6;
  1.9.5, FATE#321510; 1.9.4, FATE#320665; 1.8.3, FATE#318542):
  • <a href=“https://sourceforge.net/p/tboot/code/ci/default/tree/CHANGELOG”>https://sourceforge.net/p/tboot/code/ci/default/tree/CHANGELOG</a>
• Fix some gcc7 warnings that lead to errors. (boo#1041264)
• Fix wrong pvops kernel config matching (boo#981948)
• Fix a excessive stack usage pattern that could lead to resets/crashes
  (boo#967441)
• fixes a boot issue on Skylake (boo#964408)
• Trim filler words from description; use modern macros over shell vars.
• Add reproducible.patch to call gzip -n to make build fully reproducible.