luarocks: fix with-luajit not finding lua headers

Library/Formula/luarocks.rb

@@ -11,6 +11,9 @@ class Luarocks < Formula
 
   if build.include? 'with-luajit'
     depends_on 'luajit'
+    # luajit depends internally on lua being installed
+    # and is only 5.1 compatible, see #25954
+    depends_on 'lua'
   elsif build.include? 'with-lua52'
     depends_on 'lua52'
   else