LuaJIT doesn't depend on Lua

The LuaJIT interpreter doesn't depend on the stock Lua interpreter; it
can be built entirely on its own.  We also install a non-versioned link
to the interpreter, at #{HOMEBREW_PREFIX}/bin/luajit.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/luajit.rb

@@ -6,9 +6,12 @@ class Luajit < Formula
   homepage 'http://luajit.org/luajit.html'
   md5 'bfcbe2a11162cfa84d5a1693b442c8bf'
 
-  depends_on 'lua'
+  # Skip cleaning both empty folders and bin/libs so external symbols still work.
+  skip_clean :all
 
   def install
     system "make", "PREFIX=#{prefix}", "install"
+    # Non-versioned symlink
+    ln_s bin+"luajit-#{version}", bin+"luajit"
   end
 end