google-cloud-sdk: remove crcmod_osx as well
google-cloud-sdk: remove crcmod_osx as well

Both third_party/crcmod_osx and third_party/crcmod are only used in the
PYTHONPATH, and we already replace them with dependencies from 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,NixOS/nixpkgs