piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 5d162d5a7b6b8ce9075cd6987cc6cda119b433ff

Nick Mathewson 5d162d5a7b Fix a dependency: sha256.c influences crypto.o, not crypto.c		13 lat temu
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bug6778	5d162d5a7b Fix a dependency: sha256.c influences crypto.o, not crypto.c	13 lat temu
ssize_t_warning	5d679caa32 Fix warning when implicitly casting strlen(microdesc) to int	13 lat temu