- After finishing the first buildloop we have to go back to
  toplevel srcdir
- This commit also changes the priority of the preconf hook we
  use while building multilib.

  Warning:
  The change of the priority is very sensitive, so you should
  just change it if you really know what you are doing!

- To be able to build "pure" x86-64 systems (non-multilib) we need to remove
  this hardwired multilib by default behavior from the x86-64 architecture
  configuration.

Note:
From now on we do not rely on the glibc32 package anymore by using a second
buildloop while building a 64bit multilib target.

git-svn-id: svn://svn.opensde.net/opensde/opensde/trunk@20073 10447126-35f2-4685-b0cf-6dd780d3921f