Unrolled build for rust-lang#132907

Rollup merge of rust-lang#132907 - BLANKatGITHUB:intrinsic, r=saethlin

Change intrinsic declarations to new style

Pr is for issue rust-lang#132735
This changes the first `extern "rust-intrinsic"` block to the new style.
r? `@RalfJung`