CCInt(chore): conditionally define function existing in newer OCaml

Author: FardaleM

src/core/CCInt.ml

@@ -102,9 +102,13 @@ end
 
 include Infix
 
+[@@@iflt 4.13]
+
 let min : t -> t -> t = Stdlib.min
 let max : t -> t -> t = Stdlib.max
 
+[@@@endif]
+
 let floor_div a n =
   if a < 0 && n >= 0 then
     ((a + 1) / n) - 1

src/core/CCInt.mli

@@ -59,6 +59,8 @@ val to_string_binary : t -> string
 (** [to_string_binary x] returns the string representation of the integer [x], in binary.
     @since 0.20 *)
 
+[@@@iflt 4.13]
+
 val min : t -> t -> t
 (** [min x y] returns the minimum of the two integers [x] and [y].
     @since 0.17 *)
@@ -67,6 +69,8 @@ val max : t -> t -> t
 (** [max x y] returns the maximum of the two integers [x] and [y].
     @since 0.17 *)
 
+[@@@endif]
+
 val range_by : step:t -> t -> t -> t iter
 (** [range_by ~step i j] iterates on integers from [i] to [j] included,
     where the difference between successive elements is [step].