netbsd.common: just export the sources
netbsd.common: just export the sources

"common" is just a lot of shared code, not a component in and of
itself.  There's no Makefile, so if we try to build it Make will go up
a directory and try to build all of NetBSD.

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