Auto merge of #161128 - JonathanBrouwer:rollup-8wE5OZB, r=JonathanBrouwer

Rollup of 5 pull requests

Successful merges:

 - rust-lang/rust#161111 (Take bors try-perf branch into account in verify-channel.sh)
 - rust-lang/rust#158504 (Stabilize `extern "custom"`)
 - rust-lang/rust#161030 (mailmap: fix nia's gazillion emails)
 - rust-lang/rust#161105 (rustdoc: Small `doc_cfg` messages improvements)
 - rust-lang/rust#161123 (bootstrap: Clean up some inconsistent imports and paths)