arc-theme: 20190330 -> 20190910
arc-theme: 20190330 -> 20190910

- Update version number
- Update repository owner
- Update home page
- Remove build time dependency on gnome3.gnome-shell: only gnome-shell
  version is needed
- Linking gnome-shell support for 3.30 to 3.32 is not needed anymore
- patchShebangs is not needed

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