[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, 2 insertions, 2 deletions

diff --git a/library/global.ml b/library/global.ml
index 98d3e9cb1f..d4262683bb 100644
--- a/library/global.ml
+++ b/library/global.ml
@@ -201,10 +201,10 @@ let is_type_in_type r = is_type_in_type (env ()) r
 let current_modpath () =
   Safe_typing.current_modpath (safe_env ())
 
-let current_dirpath () = 
+let current_dirpath () =
   Safe_typing.current_dirpath (safe_env ())
 
-let with_global f = 
+let with_global f =
   let (a, ctx) = f (env ()) (current_dirpath ()) in
     push_context_set false ctx; a