Update to new rust-toolchain

.gitmodules

Cargo.lock

Cargo.toml

core_io

posix-regex

rust-toolchain

src/c_str.rs

src/crt0/src/lib.rs

src/crti/src/lib.rs

src/crtn/src/lib.rs

src/header/_oldlib/dns/answer.rs

src/header/_oldlib/dns/mod.rs

src/header/_oldlib/dns/query.rs

src/header/_oldlib/event.rs

src/header/_oldlib/file.rs

src/header/_oldlib/folder.rs

src/header/_oldlib/hostname.rs

src/header/_oldlib/lib.rs

src/header/_oldlib/macros.rs

src/header/_oldlib/mallocnull.rs