[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/lib/pp.ml b/lib/pp.ml
index 2f780677d9..3e9ab2a82b 100644
--- a/lib/pp.ml
+++ b/lib/pp.ml
@@ -265,7 +265,7 @@ let prlist_sep_lastsep no_empty sep_thunk lastsep_thunk elem l =
     | h::t   -> h ++ sep ++ insert_seps t
   in
   insert_seps filtered_elems
-  
+
 let prlist_strict pr l = prlist_sep_lastsep true mt mt pr l
 (* [prlist_with_sep sep pr [a ; ... ; c]] outputs
    [pr a ++ sep() ++ ... ++ sep() ++ pr c] *)