These generated files were added in https://github.com/coq/coq/pull/745
Add .vok files from https://github.com/coq/coq/pull/11075
Add various files that show up when you run tactics (the *.cache in 8.4 and 8.5, .*.cache in 8.6), build plugins (the various OCaml files), and for the native compiler of Coq 8.5.