piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ ac1942ac58d631af036acc97c73dad9d89b23aaf

Chelsea H. Komlo eb355e031e use CARGO_HOME instead of HOME when building with rust		6 lat temu
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tests	f8ef7c65d1 Add some Rust utility functions and print support	7 lat temu
Cargo.toml	f8ef7c65d1 Add some Rust utility functions and print support	7 lat temu
ffi.rs	f8ef7c65d1 Add some Rust utility functions and print support	7 lat temu
include.am	eb355e031e use CARGO_HOME instead of HOME when building with rust	6 lat temu
lib.rs	f8ef7c65d1 Add some Rust utility functions and print support	7 lat temu
rust_string.rs	f8ef7c65d1 Add some Rust utility functions and print support	7 lat temu