[dev] Add include versions for Dune builds.

Fixes #9537

This way, users can do:
```
dune exec coqtop.byte
> Drop.
 # #directory "dev";;
 # #use "include_dune";;
```

1 files changed, 16 insertions, 0 deletions

diff --git a/dev/incdir b/dev/incdir
new file mode 100644
index 0000000000..8ffd6bf6dc
--- /dev/null
+++ b/dev/incdir
@@ -0,0 +1,16 @@
+#cd".";;
+#directory "parsing";;
+#directory "interp";;
+#directory "toplevel";;
+#directory "library";;
+#directory "kernel";;
+#directory "gramlib";;
+#directory "engine";;
+#directory "pretyping";;
+#directory "lib";;
+#directory "proofs";;
+#directory "tactics";;
+#directory "printing";;
+#directory "grammar";;
+#directory "stm";;
+#directory "vernac";;