piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ b923c4dc9f011ab8f62e03211407d042dbe9f92a

Nick Mathewson b923c4dc9f Code to disable memory sentinels for fuzzing		9 lat temu
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.dummy	df76da0f3b Add a .dummy file in the changes directory to stop git from removing it	10 lat temu
bug21439	b923c4dc9f Code to disable memory sentinels for fuzzing	8 lat temu