ocaml 4.13 changed capitalization of some of the lib files which confuses some of the findlib build tests (and then leads to fallback code which depends on ocamlbuild). A newer version of findlib addresses this. In addition, findlib 1.9.4 added proper DESTDIR support, so we can drop FAKE_FLAGS from the port Makefile as part of this update. Diff from Volker Schlecht; and tested by myself on amd64.