Add printf from busybox
Remove dropbear
Remove irc - we have sic
Remove dropbearkeys
Create /emul as well
Create a 4GB img by default
Add arch-rootfs build script
Creates overlay images and boot scripts
We can build with dash too now

Also rename pkgs/arch-rootfs to pkgs/emul.

The create-bootable script still needs to be fixed
to work with dash.
Don't use += in sh
Remove gnulibfix
LIES LIES LIES!
Use test
Use set +h and reset umask in stage0
Remove busybox fsck
Also create /dev/pts and /dev/shm
Remove set +h

It is not portable.
Remove unused entries in DEPS
Add tinyxlib and tinyxserver
List dependencies explicitly

This is by far the simplest approach as packages previously
in cross-scripts/ could also depend on other packages.