- vendored libraries are replaced by files in `vendor/boot`
- files named `XXX.boot.EXT` replace their `XXX.EXT` equivalent
For instance, to build boot.exe, we use `src/glob_lexer.boot.ml`
rather than `src/glob_lexer.ml` (which would be generated from
`src/glob_lexer.mll`).
Jeremie Dimino