Revert "A new infrastructure for warnings."

This reverts commit 925d258d7d03674c601a1f3832122b3b4b1bc9b0.

I forgot that Jenkins gave me a spurious success when trying to build this PR.
There are a few rough edges to fix, so reverting meanwhile. The Jenkins issue
has been fixed by Matej. Sorry for the noise.

1 files changed, 2 insertions, 7 deletions

diff --git a/kernel/nativeconv.ml b/kernel/nativeconv.ml
index 2f985e15ac..a0ff9e123a 100644
--- a/kernel/nativeconv.ml
+++ b/kernel/nativeconv.ml
@@ -145,16 +145,11 @@ let native_conv_gen pb sigma env univs t1 t2 =
       end
   | _ -> anomaly (Pp.str "Compilation failure") 
 
-let warn_no_native_compiler =
-  let open Pp in
-  CWarnings.create ~name:"native-compiler-disabled" ~category:"native-compiler"
-         (fun () -> strbrk "Native compiler is disabled," ++
-                      strbrk " falling back to VM conversion test.")
-
 (* Wrapper for [native_conv] above *)
 let native_conv cv_pb sigma env t1 t2 =
   if Coq_config.no_native_compiler then begin
-    warn_no_native_compiler ();
+    let msg = "Native compiler is disabled, falling back to VM conversion test." in
+    Feedback.msg_warning (Pp.str msg);
     vm_conv cv_pb env t1 t2
   end
   else