python310Packages.libversion: fix cross

pkgs/development/python-modules/libversion/default.nix

···
     sha256 = "sha256-p0wtSB+QXAERf+57MMb8cqWoy1bG3XaCpR9GPwYYvJM=";
   };
 
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "'pkg-config'" "'$(command -v $PKG_CONFIG)'"
+  '';
+
   nativeBuildInputs = [
     pkg-config
   ];