To celebrate

- getting rid of `libCross` (https://github.com/NixOS/nixpkgs/pull/414321 and https://github.com/NixOS/nixpkgs/pull/414573)

- making `gccNgPackages` (https://github.com/NixOS/nixpkgs/pull/414299)

I wrote this blog post explaining the bigger pictures behind these two