ocaml: phase 5.1 wildcard_match.ml baseline (* / ? matcher, 6/18 match)

Recursive wildcard matcher:

  let rec is_match s i p j =
    if j = String.length p then i = String.length s
    else if p.[j] = '*' then
         is_match s i p (j + 1)             (* * matches empty   *)
      || (i < String.length s && is_match s (i + 1) p j)  (* * eats char *)
    else
      i < String.length s
      && (p.[j] = '?' || p.[j] = s.[i])
      && is_match s (i + 1) p (j + 1)

Patterns vs texts:
  a*b      | aaab abc abxyz xy xyz axby   -> 1 match
  ?b*c     | aaab abc abxyz xy xyz axby   -> 1 match
  *x*y*    | aaab abc abxyz xy xyz axby   -> 4 matches
                                  total   = 6

Tests deeply nested short-circuit && / ||, char equality on
pattern bytes, doubly-nested List.iter cross product.

173 baseline programs total.

lib/ocaml/baseline/expected.json

@@ -157,6 +157,7 @@
   "tic_tac_toe.ml": 1,
   "topo_dfs.ml": 24135,
   "topo_sort.ml": 6,
+  "wildcard_match.ml": 6,
   "word_freq.ml": 8,
   "xor_cipher.ml": 601,
   "zerosafe.ml": 28,