nixos-rebuild: Allow to use --repair.
nixos-rebuild: Allow to use --repair.

Unfortunately, the flag only works directly and without the daemon, so
this adds an extra variable $repair, to avoid the daemon. This is to
avoid to iterate through the $extraBuildFlags just to test whether
"--repair" exists.

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

SymbiFlow/nixpkgs,NixOS/nixpkgs,andreassalomonsson/nixos,SymbiFlow/nixpkgs,NixOS/nixos,andreassalomonsson/nixos,NixOS/nixpkgs,andreassalomonsson/nixos,triton/triton,andreassalomonsson/nixos,triton/triton,NixOS/nixpkgs,NixOS/nixos,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixos,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixos,NixOS/nixos,triton/triton,NixOS/nixos,SymbiFlow/nixpkgs,NixOS/nixpkgs,andreassalomonsson/nixos,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,triton/triton,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,triton/triton,triton/triton,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,triton/triton,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,andreassalomonsson/nixos,triton/triton,NixOS/nixpkgs,SymbiFlow/nixpkgs