[gentoo] the new xfs fs support

[m.w.chang]

it's the 1.4 rc2 686 LiveCD

just downloaded the gentoo 1.4rc2 LiveCD.
the installation guide didn't mention how to create a xfs root 
partition. what should I do to use xfs?	

btw, the step of using dd to clean the first 1k of partition could be 
dangerous, isn't it? a wrong output device will render your harddisk 
unbootable, if not daming the FAT of an existing data partition.... :)

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