Fix recursive STAGEDIR referencing.
This was fixed after initial commit in bsd.ocaml.mk r349286.
===> Checking for items in STAGEDIR missing from pkg-plist Error: Orphaned: @dir /wrkdirs/usr/ports/graphics/ocaml-images/work/stage/usr/local/%%OCAML_SITELIBDIR%% Error: Orphaned: @dir /wrkdirs/usr/ports/graphics/ocaml-images/work/stage/usr/local/lib/ocaml Error: Orphaned: @dir /wrkdirs/usr/ports/graphics/ocaml-images/work/stage/usr/local/lib ...