[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/clib/cThread.ml b/clib/cThread.ml
index 434b234ba1..953b51ed02 100644
--- a/clib/cThread.ml
+++ b/clib/cThread.ml
@@ -16,7 +16,7 @@ let thread_friendly_read_fd fd s ~off ~len =
   let rec loop () =
     try Unix.read fd s off len
     with Unix.Unix_error(Unix.EINTR,_,_) -> loop ()
-  in 
+  in
     loop ()
 
 let thread_friendly_read ic s ~off ~len =