I'm having troubles with LuaLaTeX and the `listings` package: the former doesn't seem to accept me performing `\lstinputlisting` on a filename that doesn't have an extension.

Minimal example:

`Makefile`:

```
hello: hello.c
    cc -o hello hello.c

```

`test.tex`:

```
\documentclass[a4paper]{article}
\usepackage{listings}
\begin{document}
\lstinputlisting{Makefile}
\end{document}

```

pdfLaTeX is successful, LuaLaTeX displays the following error:

```
! Package Listings Error: File `Makefile(.tex)' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: tex)

Enter file name:

```

I'm using the freshest versions from TeXLive 2012 (pdfTeX 3.1415926-2.4-1.40.13, LuaTeX beta-0.70.2-2012052410).

What's the trouble?