The 18c3f2ad32 'cleanup script to free 58GB of build artifacts' commit
erroneously deleted local/patches/tokio/vendored/src/runtime/task/core.rs,
which is a tracked source file (not a build artifact). mod.rs:181 declares
'mod core;' and imports Cell + Header from it, so the vendored tokio 1.52.3
tree fails to compile with E0583 'file not found for module core'.
Restored byte-identically from 18c3f2ad32^ (= 04b7641e85, the original
vendoring commit) so pkgutils/installer transitive tokio-rustls builds
succeed again.
vasilito
e39b3f7984