get some error since the opam-repository windows support landed

[hannesm]

since ocaml/opam-repository#25861 got merged, I can see the following error, which should be looked into further:

6m40s [ORB] error in duni_deps: set_of_formula: couldn't figure out or (((system-mingw) | system-msvc)) | (((system-mingw) | system-msvc))

[hannesm]

I need some time to refactor and update to opam 2.2, but this change helped with the issue:

--- a/src/duni_deps.ml
+++ b/src/duni_deps.ml
@@ -11,11 +11,15 @@
 let deps opam =
   let depends = OpamFile.OPAM.depends opam in
   let env var = match OpamVariable.Full.to_string var with
-    | "monorepo" | "vendor" -> Some (OpamTypes.B true)
-    | "build" | "with-test" | "dev" | "with-doc" | "post" -> Some (B false)
+    | "monorepo" | "vendor" | "post" -> Some (OpamTypes.B true)
+    | "build" | "with-test" | "dev" | "with-doc" -> Some (B false)
+    | "os" -> Some (S "freebsd")
+    | "os-family" -> Some (S "bsd")
+    | "os-distribution" -> Some (S "freebsd")
+    | "arch" -> Some (S "x86_64")
     | _ -> None
   in
-  OpamFilter.filter_formula ~default:false env depends
+  OpamFilter.filter_formula env depends
 
 let map_of_formula f =
   let v = function

[hannesm]

fixed in e3a6021