Use ocaml-env with LF

Author: chenglou

.github/workflows/ci.yml

@@ -31,8 +31,8 @@ jobs:
               echo "cat -A Auto.res.txt"
               cat -A tests/src/expected/Auto.res.txt
               echo "make now===="
-              # & $env:CYGWIN_ROOT\\bin\\ocaml-env exec -- make foo
-              make foo
+              & $env:CYGWIN_ROOT\\bin\\ocaml-env exec -- make foo
+              # make foo
             artifact-folder: win32
 
     runs-on: ${{matrix.os}}