History of main 2 changes

In crates/hub/build.rs, lines 4–22 on 6ca0b971ff07e7427ccf4652b7dcb573c03f4027399d3b6d244b83b47ec48677. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 4,22:crates/hub/build.rs.