Upgrade to nixos-21.05

Getting me closer to the latest GHC. This release also includes my own packages
that I submitted some time ago.

GHCJS is not present in 21.05 for some reason, but I think it's back in master,
so I might do another upgrade soon, but for now I just disabled my GHCJS
support. I'm not really using it anyway.

I also had to bring it string-quote, update nixos-mailserver, and a few other
things.

1 files changed, 1 insertions, 0 deletions

diff --git a/Biz/Bild/Nixpkgs.nix b/Biz/Bild/Nixpkgs.nix
index 262ec6f..6b442a0 100644
--- a/Biz/Bild/Nixpkgs.nix
+++ b/Biz/Bild/Nixpkgs.nix
@@ -29,5 +29,6 @@ import sources.nixpkgs {
   ];
   config = {
     allowBroken = true;
+    allowUnfree = true;
   };
 }