[autotools] Remove second call to AM_INIT_AUTOMAKE.

Complained by autoconf 1.14, cf. FS#1462.
Thanks to Claus for the heads-up.

bin/duneproject

@@ -329,11 +329,9 @@ cat > "$PROJECT/configure.ac" <<C_DELIM
 # Process this file with autoconf to produce a configure script.
 AC_PREREQ([2.62])
 DUNE_AC_INIT # gets module version from dune.module file
-AM_INIT_AUTOMAKE
 AC_CONFIG_SRCDIR([src/$CMODULE.cc])
 AC_CONFIG_HEADERS([config.h])
 
-
 # we need no more than the standard DE-stuff
 # this module depends on $DEPENDENCIES
 # this implies checking for $CHECK

configure.ac

-#! /bin/bash
+# -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.62])
 DUNE_AC_INIT # gets module version from dune.module file
-AM_INIT_AUTOMAKE
 AC_CONFIG_SRCDIR([dune/common/stdstreams.cc])
 AC_CONFIG_HEADERS([config.h])