Sunday [1] filed a deletion request for rtl8188eu-git [2]:
This PKGBUILD is outdated and apparently orphaned. For the dkms-
enabled variant there is a replacement PKGBUILD (8188eu-dkms-git).
Also this driver is in the kernel (staging) and it should not be
needed to install it seperately in most cases.
[1] https://aur.archlinux.org/account/Sunday/
[2] https://aur.archlinux.org/pkgbase/rtl8188eu-git/