tests/thirdparty: add github.com/oasisprotocol/deoxysii

[mmcloughlin]

Updates #246.

[codecov-commenter]

Codecov Report

Merging #247 (7204e5f) into master (ed62fe0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #247   +/-   ##
=======================================
  Coverage   76.12%   76.12%           
=======================================
  Files          65       65           
  Lines       20538    20538           
=======================================
  Hits        15634    15634           
  Misses       4825     4825           
  Partials       79       79           

Flag	Coverage Δ
integration	11.84% <ø> (ø)
stress	?
unittests	73.22% <ø> (ø)

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