I shouldn't be doing patch reviews after 2300

Here is Andreas' commit message:

>From 1049843fa0dbc6b340817b0cd69959e742e80d7a Mon Sep 17 00:00:00 2001
From: Andreas Lauser <Andreas.Lauser@iws.uni-stuttgart.de>
Date: Wed, 6 Feb 2013 23:33:28 +0100
Subject: [PATCH] once again: fix dune_unused.m4

my previous attempt was only partially correct: the compiler did not
chocke because the unused attribute was placed behind the variable,
but because the third argument of AC_TRY_COMPILE is placed inside the
main function. it seems like c++ does not support nested functions, so
the test still failed, leading to the equally undesired result that
DUNE_UNUSED did not have an effect anymore. Mea culpa!

(this time I have at least double verified, that the compiler does not
bail out. last time I probably mis-interpreted the wrong lines as the
output of the dune_unused test in config.log.)


[[Imported from SVN: r7106]]