piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ c2a098e9800edb27d6a3630337e0efa72dfa7ba2

Nick Mathewson c2a098e980 Fix a double-free that would occur on an invalid cert in a CERTS cell		14 lat temu
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bug4331	f6b1dc2805 Fix typo, spotted by tmpname0901. Thanks!	14 lat temu
bug4343	c2a098e980 Fix a double-free that would occur on an invalid cert in a CERTS cell	14 lat temu