archive rebuild with 2.18 branch, trunk and trunk+gold

[Matthias Klose]

After a test rebuild of the current Debian unstable archive (+12k source
packages) on i386 using the 2.18 branch, we did two more rebuilds using binutils
trunk 20080425 and 20080425 configured with gold support. Some packages did fail
to build with the updated binutils.

- build logs at [1]; one ICE, see PR6494, the other build failures need
  updates in the packages.

- gold build logs at [2], many builds succeed, but a lot of noise, because the
  packaging tries to call
  `strip --remove-section=.comment --remove-section=.note'. See PR6498.

- gold itself fails to build with -Werror (PR 6493).

Thanks to Lucas for doing these test builds.

  Matthias

[1] http://people.debian.org/~lucas/logs/2008/04/30/
[2] http://people.debian.org/~lucas/logs/2008/04/26/