Add ocaml-c experiments

ocaml-c/.gitignore

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+*.cma
+*.cmi
+*.cmo
+*.so
+*.o
+*.a

ocaml-c/funs.ml

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+external send_an_int: int -> unit = "get_an_int"

ocaml-c/funs.mli

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+external send_an_int : int -> unit = "get_an_int"

ocaml-c/wrap.c

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+#include <stdio.h>
+#include <caml/mlvalues.h>
+
+CAMLprim value
+get_an_int( value v )
+{
+    int i;
+    i = Int_val(v);
+    printf("%d\n", i);
+    return Val_unit;
+}