build: Configure the `ruled` module dependency graph.

It is the topmost module, it can use everything, but nothing can use it.

build-utils/check_for_invalid_requires.lua

@@ -34,7 +34,10 @@ local allowed_deps = {
         wibox = true,
 
         -- Necessary to lazy-load the deprecated modules.
-        ["awful.*"] = true
+        ["awful.*"] = true,
+
+        -- For legacy reasons.
+        ruled = true
     },
     naughty = {
         awful = true,
@@ -50,6 +53,14 @@ local allowed_deps = {
         lgi = true,
         wibox = true,
     },
+    ruled = {
+        awful = true,
+        beautiful = true,
+        gears = true,
+        lgi = true,
+        wibox = true,
+        naughty = true,
+    },
     -- TODO: Get rid of these
     ["gears.surface"]        = { ["wibox.hierarchy"] = true },
 }