Revert "arch-nspawn: Work around pacman master returning file-URLs from the cache"

This reverts commit eb6b0e3f11279b6512b1469ff042d2982eaaeef4.

This never worked, as pacman-git returns file urls from the cache anyway
and pacman stable doesn't have any problem at all. Having useless code
which makes people think the issue is solved when it really isn't, is
bloat, so remove it.

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