Merge #227919: stdenv: avoid -p flag for strip on aarch64-darwin

...into staging-next

pkgs/stdenv/darwin/default.nix

···
     unset SDKROOT
 
     stripAllFlags=" " # the Darwin "strip" command doesn't know "-s"
-  '' + lib.optionalString localSystem.isx86_64 ''
     stripDebugFlags="-S" # the Darwin "strip" command does something odd with "-p"
   '';