refactor(third_party/lisp): Amend alexandria drv for local sources

third_party/lisp/alexandria/default.nix

@@ -0,0 +1,28 @@
+# Alexandria is one of the foundational Common Lisp libraries that
+# pretty much everything depends on:
+#
+# Imported from https://common-lisp.net/project/alexandria/
+{ pkgs, ... }:
+
+pkgs.nix.buildLisp.library {
+  name = "alexandria";
+  srcs = [
+    ./package.lisp
+    ./definitions.lisp
+    ./binding.lisp
+    ./strings.lisp
+    ./conditions.lisp
+    ./symbols.lisp
+    ./macros.lisp
+    ./functions.lisp
+    ./io.lisp
+    ./hash-tables.lisp
+    ./control-flow.lisp
+    ./lists.lisp
+    ./types.lisp
+    ./arrays.lisp
+    ./sequences.lisp
+    ./numbers.lisp
+    ./features.lisp
+  ];
+}