systemd: Fix error: attribute 'version' missing on arm-embedded

`pkgsCross.arm-embedded.systemd`

Author: Artturin

pkgs/os-specific/linux/systemd/default.nix

@@ -120,7 +120,12 @@
   withLibBPF ?
     lib.versionAtLeast buildPackages.llvmPackages.clang.version "10.0"
     # assumes hard floats
-    && (stdenv.hostPlatform.isAarch -> lib.versionAtLeast stdenv.hostPlatform.parsed.cpu.version "6")
+    && (
+      stdenv.hostPlatform.isAarch
+      ->
+        stdenv.hostPlatform.parsed.cpu ? version
+        && lib.versionAtLeast stdenv.hostPlatform.parsed.cpu.version "6"
+    )
     # see https://github.com/NixOS/nixpkgs/pull/194149#issuecomment-1266642211
     && !stdenv.hostPlatform.isMips64
     # can't find gnu/stubs-32.h