[coq] Untabify the whole ML codebase.

We also remove trailing whitespace.

Script used:

```bash
for i in `find . -name '*.ml' -or -name '*.mli' -or -name '*.mlg'`; do expand -i "$i" | sponge "$i"; sed -e's/[[:space:]]*$//' -i.bak "$i"; done
```

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/context.ml b/kernel/context.ml
index 2ef750ad69..7e394da2ed 100644
--- a/kernel/context.ml
+++ b/kernel/context.ml
@@ -74,7 +74,7 @@ struct
     let get_value = function
       | LocalAssum _ -> None
       | LocalDef (_,v,_) -> Some v
-                                 
+
     (** Return the type of the name bound by a given declaration. *)
     let get_type = function
       | LocalAssum (_,ty)