gerbil: reenable stackprotector on aarch64-darwin
gerbil: reenable stackprotector on aarch64-darwin

The original error that required disabling the stack protector on
aarch64-darwin has been fixed in GCC.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs