broken kernel syscalls on ppc64

[Anton Blanchard]

> Another side effect of this is kernel_thread doesn't work if the parent
> process is 32 bit e.g. bash on SLES8.

In 2.5 this should be fixed, we clear the 32bit flag in copy_process if
we are creating a kernel thread.

Im surprised a similar fix is not in 2.4, I hit this exact problem with
the tux webserver there.

Anton

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