Update devel/ocaml-optint to version 0.0.4.

Pkgsrc changes:
* set version# only once

Upstream changes:

v0.0.4 2020-03-09 Paris (France)

* Fix 32bit backend where we miss to fully apply an invalid_arg
* Fix 64bit backend where Native.unsigned_compare and
  Nativeint.unsigned_div exists (OCaml 4.08.0)

v0.0.3 2010-09-12 Paris (France)

* Avoid partial application of function (#2, @dinosaure)
* Add [@immediate] tag (#4, @dinosaure)
* Fix select.ml in 32bit (#5, @IndiscriminateCoding)
* Fix typo (#6, @hannesm)
* Add fuzzer (#8, @dinosaure)
* Fix lsr and asr in 64bit (#8, @cfcs, @dinosaure)
* Optimization on of_int function (64bit) (#8, @cfcs, @dinosaure)
* Optimization on abs function (64bit) (#8, @cfcs, @dinosaure)
* Fix 32bit architecture, keep bit-sign in the same place (#8,
  @dinosaure, review @cfcs)

OK'ed by jaapb@

(he)