chore(3p/lisp): use nixpkgs sources for fiveam

Change-Id: Id0613ace9b77d3ad46cdf2366e84d026d1158ace
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4340
Autosubmit: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

third_party/lisp/fiveam.nix

@@ -0,0 +1,29 @@
+# FiveAM is a Common Lisp testing framework.
+#
+# Imported from https://github.com/sionescu/fiveam.git
+
+{ depot, pkgs, ... }:
+
+let src = with pkgs; srcOnly lispPackages.fiveam;
+in depot.nix.buildLisp.library {
+  name = "fiveam";
+
+  deps = with depot.third_party.lisp; [
+    alexandria
+    asdf-flv
+    trivial-backtrace
+  ];
+
+  srcs = map (f: src + ("/src/" + f)) [
+    "package.lisp"
+    "utils.lisp"
+    "check.lisp"
+    "fixture.lisp"
+    "classes.lisp"
+    "random.lisp"
+    "test.lisp"
+    "explain.lisp"
+    "suite.lisp"
+    "run.lisp"
+  ];
+}