merge(glittershark/achilles): Subtree import at 'b93268085a'

Imported from https://github.com/glittershark/achilles/

git-subtree-dir: users/glittershark/achilles
git-subtree-mainline: 4d193f2395
git-subtree-split: b93268085a
Change-Id: I64a583b454bbe03e20358ad7808939a4cbc212ba

users/glittershark/achilles/shell.nix

@@ -0,0 +1,20 @@
+with import (builtins.fetchTarball {
+  url = "https://github.com/nixos/nixpkgs/archive/93a812bb9f9c398bd5b9636ab3674dcfe8cfb884.tar.gz";
+  sha256 = "14zzsgnigd7vjbrpzm1s4qsknm73sci38ss00x96wamz6psaxyah";
+}) {};
+
+mkShell {
+  buildInputs = [
+    clang_11
+    llvm_11.lib
+    llvmPackages_11.bintools
+    llvmPackages_11.clang
+    llvmPackages_11.libclang.lib
+    zlib
+    ncurses
+    libxml2
+    libffi
+    pkg-config
+  ];
+
+}