History of main 2 changes

In crates/hub/build.rs, lines 4–22 on addec2bd64233dc417bc7fe3def21815b5960fcb4381bd5d35a8fc2db07594f3. 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.