[arch-releng] reduce image size

[Christian Hesse]

Hello everybody,

now that we support root filesystem on squashfs/overlayfs... Do we want to
reduce image size some more?

Currently we generate a squashfs for each architecture, one for x86_64 and
one for i686. How about merging these into one filesystem? Only extra thing
to do is a bind mount for the subdirectory to /new_root.

The benefit is the deduplication support in squashfs, identical files are
added to the filesystem just once. I did not yet test with the official media,
but I'd expect the size to shrink about 120MB...

This has a drawback, though: Copy-to-RAM would copy the files for both
architectures, not just the needed one.

Any comments?
-- 
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putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}
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