Add FFI chapter from the first edition of TRPL to nomicon #21
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The FFI page has been copied almost verbatim from the first edition of TRPL in the master branch of rust-lang/book.
I've made changes to two links that would otherwise be broken due to TRPL being a directory lower than nomicon: see 2nd commit. Unfortunately, the links will be broken in the nomicon if it's built by itself outside of rust-lang/rust.