Will require pacman-4.1 before this really gets done.
That probably was installed with your cross compiler too. Get rid of it.
File a bug: bugs.archlinux.org ... It seems it was missed in the rebuild.
netinstall has all the changes automatically.
Just say "N" to upgrading pacman first.
Bug report is needed.
Hrm... I have no idea what is causing this then.
Use a newer iso.
You need a newer iso - as in newer than the released version.... http://releng.archlinux.org/