Mark ocamlfind as a hard-dependency

jbuilder.opam

@@ -10,10 +10,13 @@ build: [
   ["ocaml" "bootstrap.ml"]
   ["./boot.exe" "-j" jobs]
 ]
-depopts: [
-  # This dependency is here just to prevent a race condition
-  # as jbuilder calls `ocamlfind printconf path`
-  # when ocamlfind is present in the PATH
+depends: [
+  # ocamlfind is not mandatory to build packages using
+  # jbuilder. However if it is present jbuilder will use it.  Making
+  # it a hard-dependency avoids problems when there is a previous
+  # ocamlfind in the PATH. We make it a "build" depepdency even though
+  # it is only a runtime dependency so that reinstalling ocamlfind
+  # doesn't resintall jbuilder
   "ocamlfind" {build}
 ]
 available: [ ocaml-version >= "4.02.3" ]