patch wine to support UNC paths

overlays/wine.nix

@@ -2,10 +2,21 @@
 # files from TH code) for GHC built with msvcrt (ghc<9.6).
 # This will inevitably replace *any* wine version. Thus this might not really be what we ultimately want.
 # Wine 5.4 does not build on macOS so that is not pinned and TH code will probably break.
-final: prev: {
-  winePackages = prev.winePackages // {
-    minimal = prev.winePackages.minimal.overrideAttrs (oldAttrs: {
-      patches = oldAttrs.patches or [] ++ [ ./patches/wine-add-dll-directory.patch ];
-    });
-  };
-}
+final: prev:
+prev.lib.optionalAttrs (!prev.stdenv.hostPlatform.isDarwin) {
+    winePackages = prev.winePackages // {
+        minimal = prev.winePackages.minimal.overrideAttrs (oldAttrs: {
+            name = "wine-5.4";
+            version = "5.4";
+            src = prev.fetchurl {
+              url = "https://dl.winehq.org/wine/source/5.x/wine-5.4.tar.xz";
+              sha256 = "sha256-Sz4rD/pUFfGZVA5gUcKMOXb86R6lv7LPSgmcJXMXBSw=";
+            };
+            patches = [] ++ [ ./patches/wine-add-dll-directory.patch ];
+            # Turning off the tests as there is a problem with the `schedsvc` test.
+            # With recent nixpkgs both the IDL files generate `_c.c` files with
+            # `handle_t rpc_handle` and that results in a linker error (duplicate symbols).
+            configureFlags = oldAttrs.configureFlags or [] ++ ["--disable-tests"];
+        });
+    };
+}