Remove RDFT dependency from AAC decoder.

Remove RDFT dependency from AAC decoder.

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>From 557176d961c70604c2a96d81aff4bd6faa670d8a Mon Sep 17 00:00:00 2001
From: Alex Converse <aconverse@google.com>
Date: Thu, 21 Apr 2011 12:11:42 -0700
Subject: [PATCH] Remove RDFT dependency from AAC decoder.
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It was used for an old implementation of the SBR filterbank.

./configure --disable-everything --disable-ffplay --enable-decoder=aac works.