python3Packages.spidev: set platforms to linux only (#122091)
python3Packages.spidev: set platforms to linux only (#122091)

The module interfaces with the linux kernel and its sysfs, so it is
unsupported on anything but Linux.
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