This makes the build environment more robust and less dependent on
live-build internals.

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=> Disable extensions.torbutton.spoof_english again.

Our "normal" pinning installs the versions found in Squeeze.
2.0~a29-1 has migrated to Squeeze.
It changes quite a lot of things (e.g. rename LH_* variables to LB_*)
which we cannot afford dealing with at this stage of the release process.
Indeed upgrading to 2.0~a29-1 would probably imply:

- adapting various bits of our build process (hooks and so on)
- re-doing the testing that has already done on T(A)ILS 0.6~rc1.

Temporary solution: include version 2.0~a21-1 of the live-build and live-helper
packages in our source tree and setup APT pinning so that they are preferred to
the version in Squeeze.

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Taken from commit d778a6094cb3501a520b936f6e8ec5bb9074b9a8 in our custom Git
repository.

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