mesa: Don't error: attribute 'driversdev' missing

`legacyPackages.aarch64-darwin.pkgsCross.aarch64-multiplatform.mesa.nativeBuildInputs`

Missing attribute errors can't be caught

pkgs/development/libraries/mesa/default.nix

@@ -289,11 +289,12 @@ in stdenv.mkDerivation {
     rustPlatform.bindgenHook
     wayland-scanner
   ] ++ lib.optionals needNativeCLC [
-    buildPackages.mesa.driversdev
+    # `or null` to not break eval with `attribute missing` on darwin to linux cross
+    (buildPackages.mesa.driversdev or null)
   ];
 
   disallowedRequisites = lib.optionals needNativeCLC [
-    buildPackages.mesa.driversdev
+    (buildPackages.mesa.driversdev or null)
   ];
 
   propagatedBuildInputs = [ libdrm ];