[core] [api] Support OCaml 4.08

The changes are large due to `Pervasives` deprecation:

- the `Pervasives` module has been deprecated in favor of `Stdlib`, we
  have opted for introducing a few wrapping functions in `Util` and
  just unqualified the rest of occurrences. We avoid the shims as in
  the previous attempt.

- a bug regarding partial application have been fixed.

- some formatting functions have been deprecated, but previous
  versions don't include a replacement, thus the warning has been
  disabled.

We may want to clean up things a bit more, in particular
w.r.t. modules once we can move to OCaml 4.07 as the minimum required
version.

Note that there is a clash between 4.08.0 modules `Option` and `Int`
and Coq's ones. It is not clear if we should resolve that clash or
not, see PR #10469 for more discussion.

On the good side, OCaml 4.08.0 does provide a few interesting
functionalities, including nice new warnings useful for devs.

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/nativecode.ml b/kernel/nativecode.ml
index a6b5fc9a41..1a5455cf3a 100644
--- a/kernel/nativecode.ml
+++ b/kernel/nativecode.ml
@@ -145,7 +145,7 @@ let dummy_symb = SymbValue (dummy_value ())
 
 let eq_symbol sy1 sy2 =
   match sy1, sy2 with
-  | SymbValue v1, SymbValue v2 -> Pervasives.(=) v1 v2 (** FIXME: how is this even valid? *)
+  | SymbValue v1, SymbValue v2 -> (=) v1 v2 (** FIXME: how is this even valid? *)
   | SymbSort s1, SymbSort s2 -> Sorts.equal s1 s2
   | SymbName n1, SymbName n2 -> Name.equal n1 n2
   | SymbConst kn1, SymbConst kn2 -> Constant.equal kn1 kn2