Move `Fingerprint::local` into a `Mutex`
Move `Fingerprint::local` into a `Mutex`

Removes the need for a wonky `with_local` method!

nipunn1313/cargo,tshepang/cargo,rustyhorde/cargo,rust-lang/cargo,eminence/cargo,tshepang/cargo,nipunn1313/cargo,tsurai/cargo,tsurai/cargo,rustyhorde/cargo,eminence/cargo,tsurai/cargo,eminence/cargo,tshepang/cargo,rustyhorde/cargo,vojtechkral/cargo,tsurai/cargo,nipunn1313/cargo,nipunn1313/cargo,tsurai/cargo,eminence/cargo,rust-lang/cargo,rustyhorde/cargo,vojtechkral/cargo,tshepang/cargo,rust-lang/cargo,vojtechkral/cargo,vojtechkral/cargo,rust-lang/cargo