Remove no longer existing IP address methods from ipcheck #312
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The is_unicast_site_local() method has been gone since Rust 1.55[1] and is_ietf_protocol_assignment() since 1.56[2].
I had to run this tool to test something, saw it wouldn't build with
modern Rust and thought I'd submit a patch.
[1] rust-lang/rust#85820
[2] rust-lang/rust#86439