fix wivrn build

etcnixos/vr.nix

@@ -5,7 +5,17 @@
     openFirewall = true;
 
     # Use my fork for WiVRn 0.20
-    package = inputs.wivrn.legacyPackages.${pkgs.system}.wivrn;
+    package = (
+      inputs.wivrn.legacyPackages.${pkgs.system}.wivrn.overrideAttrs (old: {
+        patches = [
+          (pkgs.fetchurl {
+            url = "https://github.com/WiVRn/WiVRn/commit/be95ec84b56794ca8d97bb8b21dec6443ba57bc4.diff";
+            sha256 = "1tNQ57XIki0bomNG5xg+/4YbgKanrM5LOQvvCmZQFhw=";
+          })
+        ];
+
+      })
+    );
 
     # Write information to /etc/xdg/openxr/1/active_runtime.json, VR applications
     # will automatically read this and work with wivrn