pc-windows-msvc and apple-darwin targets missing from nightly

[RalfJung]

Several tier 1 targets seem to be missing from the last nightly and also from what rustup-toolchain-install-master installs:

• https://rust-lang.github.io/rustup-components-history/i686-pc-windows-msvc.html
• https://rust-lang.github.io/rustup-components-history/x86_64-pc-windows-msvc.html
• https://rust-lang.github.io/rustup-components-history/x86_64-apple-darwin.html

Cc @rust-lang/infra

[RalfJung]

GH actions show many skipped jobs, not sure if that's normal... and no idea how to access the actual CI build for these commits.

[RalfJung]

And what's up with the auto branch having its latest commit from March?!?

[RalfJung]

Ah, looks like that branch was moved but the old one not deleted or so...

[Mark-Simulacrum]

Fixed in #76639, hopefully.

[jyn514]

Regressed in #76415