Add tuareg condition to windows test

Author: patricoferris

lib_eio_windows/test/dune

@@ -1,5 +1,13 @@
+(* -*- tuareg -*- *)
+
+let win32 = List.mem ("os_type", "Win32") Jbuild_plugin.V1.ocamlc_config
+
+let () = Jbuild_plugin.V1.send @@ if not win32 then "" else {|
+
 (test
   (name test)
   (package eio_windows)
   (enabled_if (= %{os_type} "Win32"))
   (libraries alcotest eio.mock eio_windows))
+
+|}