feat(3p/lisp): Add many packages

Add the following packages along with their transitive dependencies:
- trivial-ldap
- defclass-std
- easy-routes

Change-Id: Ib24517f18d14d57540362132c9a24ff2a5a4bd9d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1336
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: kanepyork <rikingcoding@gmail.com>

third_party/lisp/easy-routes.nix

@@ -0,0 +1,26 @@
+{ depot, pkgs, ... }:
+
+let
+
+  src = pkgs.fetchFromGitHub {
+    owner = "mmontone";
+    repo = "easy-routes";
+    rev = "dab613ff419a655036a00beecee026ab6e0ba430";
+    sha256 = "06lnipwc6mmg0v5gybcnr7wn5xmn5xfd1gs19vbima777245bfka";
+  };
+
+in depot.nix.buildLisp.library {
+  name = "easy-routes";
+  deps = with depot.third_party.lisp; [
+    hunchentoot
+    routes
+  ];
+
+  srcs = map (f: src + ("/" + f)) [
+    "package.lisp"
+    "util.lisp"
+    "easy-routes.lisp"
+    "routes-map-printer.lisp"
+  ];
+
+}