Auto merge of #6068 - eddyb:oopsie-daisy-stabilize, r=alexcrichton
Auto merge of #6068 - eddyb:oopsie-daisy-stabilize, r=alexcrichton

Remove `fix::local_paths_no_fix`, as `crate_in_paths` is getting stabilized.

Needed for rust-lang/rust#54403 (blocking RC1).
Ideally we'd also clean up the tests, e.g. removing `#![feature(rust_2018_preview)]` and `is_nightly` checks, but it's easier to just remove the only failing test (because it tests the feature gate is needed).

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