Update autogen.sh to one that does objdir != srcdir.

autogen.sh

@@ -1,3 +1,12 @@
 #! /bin/sh
+
+srcdir=`dirname $0`
+test -z "$srcdir" && srcdir=.
+
+ORIGDIR=`pwd`
+cd $srcdir
+
 autoreconf -v --install || exit 1
-./configure --enable-maintainer-mode "$@"
+cd $ORIGDIR || exit $?
+
+$srcdir/configure --enable-maintainer-mode "$@"