[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, 3 insertions, 3 deletions

diff --git a/kernel/sorts.ml b/kernel/sorts.ml
index b8bebb659b..01ee91d108 100644
--- a/kernel/sorts.ml
+++ b/kernel/sorts.ml
@@ -111,9 +111,9 @@ module Hsorts =
       type u = Universe.t -> Universe.t
 
       let hashcons huniv = function
-        | Type u as c -> 
-	  let u' = huniv u in 
-	    if u' == u then c else Type u'
+        | Type u as c ->
+          let u' = huniv u in
+            if u' == u then c else Type u'
         | s -> s
       let eq s1 s2 = match (s1,s2) with
         | Prop, Prop | Set, Set -> true