[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/lib/spawn.mli b/lib/spawn.mli
index 5321436ab0..03613fc4ec 100644
--- a/lib/spawn.mli
+++ b/lib/spawn.mli
@@ -27,7 +27,7 @@ module type Control = sig
   val kill : handle -> unit
   val wait : handle -> Unix.process_status
   val unixpid : handle -> int
-  
+
   (* What is used in debug messages *)
   val uid : handle -> string
 
@@ -54,7 +54,7 @@ module Async(ML : MainLoopModel) : sig
   (* If the returned value is false the callback is never called again and
    * the process is killed *)
   type callback = ML.condition list -> read_all:(unit -> string) -> bool
-  
+
   val spawn :
     ?prefer_sock:bool -> ?env:string array -> string -> string array ->
       callback -> process * out_channel
@@ -65,7 +65,7 @@ end
 (* spawn a process and read its output synchronously *)
 module Sync () : sig
   type process
-  
+
   val spawn :
     ?prefer_sock:bool -> ?env:string array -> string -> string array ->
       process * in_channel * out_channel