Add native build and compiler driver

opam

@@ -0,0 +1,17 @@
+opam-version: "1.2"
+name: "delta"
+version: "0.1.0"
+maintainer: "deltac@localhost"
+build: [
+  [make]
+]
+install: [
+  [make "install" "PREFIX=%{prefix}%"]
+]
+remove: [
+  [make "uninstall" "PREFIX=%{prefix}%"]
+]
+depends: [
+  "ocaml" {>= "4.04.0" & < "4.08.0"}
+]
+available: [ ocaml-version >= "4.04.0" ]