iquik: more preboot bugs

Forgot be32toh around magic check.

Signed-off-by: Andrei Warkentin <andrey.warkentin@gmail.com>
quik: Update README and distribs.

I'll add the powerpc prebuilt of the installer tomorrow :).

Signed-off-by: Andrei Warkentin <andrey.warkentin@gmail.com>