title: rpmbuild %clean phase without removing files
body: <p>I am getting the following in my build log:</p>
  
  <pre><code>Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.CgE2Qn
  + umask 022
  + cd /export/home/svn_checkouts/*snip*/Output/release/bin/packaging/BUILD
  + /bin/rm -rf /export/home/svn_checkouts/*snip*/Output/release/bin
  + exit 0
  </code></pre>
  
  <p>I'd like to avoid <code>rpmbuild</code> deleting all the files in my build directory as I need them for other things after the RPM is built. Can I override this behavior?</p>
  
  <p>I read that some versions of RPM support a <code>--noclean</code> argument, but ours doesn't unfortunately.</p>