This package was splitted, it doesn't provides anymore : libgudev, systemd, libsystemd, systemd-tools. Libgudev is now provided by libgudev-nosystemd package.
Well first remove eudev-libgudev from your system:
$ sudo pacman -Rdd eudev-libgudev
then install eudev-libgudev and libgudev-nosystemd
$ sudo pacman -S eudev-libgudev libgudev-nosystemd
This should be sufficient for working :).