Work around 9P corruption on 32-bit

On 32-bit, Linux 3.4, and if the memory size is bigger than a certain value, starting the stage 2 init script fails with "Exec format error" because the 9P filesystem is returning garbage. No such problem with Linux 3.10.

http://hydra.nixos.org/build/5737226

Created by  Eelco Dolstra  on August 21, 2013
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