python3Packages.pytest4: deterministic bytecode
python3Packages.pytest4: deterministic bytecode

For reasons that are not clear to me, the pytest4 check phase produces a
lot of non-deterministic bytecode files. This PR turns off bytecode
generation and disables a test that force enables bytecode generation.

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