Move `--sysroot` argument out of the argument file to fix miri issue#123030

bors merged 1 commit intorust-lang:masterrust-lang/rust:masterfrom

GuillaumeGomez:rustdoc-sysroot-out-of-arg-fileGuillaumeGomez/rust:rustdoc-sysroot-out-of-arg-fileCopy head branch name to clipboard