Lua: take 5.1.4-3 patch from MacPorts

Closes Homebrew/homebrew#10790.

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

Formula/lua.rb

@@ -1,8 +1,8 @@
 require 'formula'
 
 class Lua < Formula
-  url 'http://www.lua.org/ftp/lua-5.1.4.tar.gz'
   homepage 'http://www.lua.org/'
+  url 'http://www.lua.org/ftp/lua-5.1.4.tar.gz'
   md5 'd0870f2de55d59c1c8419f36e8fac150'
 
   fails_with_llvm "Lua itself compiles with LLVM, but may fail when other software tries to link.",
@@ -11,25 +11,25 @@ class Lua < Formula
   # Skip cleaning both empty folders and bin/libs so external symbols still work.
   skip_clean :all
 
-  # Be sure to build a dylib, or else runtime modules will pull in another static copy of liblua = crashy
-  # See: https://github.com/mxcl/homebrew/pull/5043
-  def patches
-    # completion provided by advanced readline power patch from
-    # http://lua-users.org/wiki/LuaPowerPatches
-    if ARGV.include? '--completion'
-      [DATA, 'http://luajit.org/patches/lua-5.1.4-advanced_readline.patch']
-    else
-      DATA
-    end
-  end
-
   def options
     [['--completion', 'Enables advanced readline support']]
   end
 
+  # Be sure to build a dylib, or else runtime modules will pull in another static copy of liblua = crashy
+  # See: https://github.com/mxcl/homebrew/pull/5043
+  def patches
+    p = [DATA]
+    # completion provided by advanced readline power patch from
+    # http://lua-users.org/wiki/LuaPowerPatches
+    if ARGV.include? '--completion'
+      p << 'http://luajit.org/patches/lua-5.1.4-advanced_readline.patch'
+    end
+    p
+  end
+
   def install
     # Apply patch-level 2
-    curl "http://www.lua.org/ftp/patch-lua-5.1.4-3", "-O"
+    curl "https://trac.macports.org/export/90538/trunk/dports/lang/lua/files/patch-lua-5.1.4-3", "-O"
     safe_system '/usr/bin/patch', '-d', 'src', '-i', '../patch-lua-5.1.4-3'
     # we could use the patches method if it supported additional arguments (-d in our case)