[PRQ#66671] Merge Request for gdm-plymouth-prime

MarsSeed [1] filed a request to merge gdm-plymouth-prime [2] into gdm- prime [3]: The former package is abandoned and obsolete. The latter is the successor, and is actively maintained. "plymouth" is not needed to be specified in pkgname anymore, as both Arch/extra/gdm and AUR/gdm-prime are built with optional plymouth support. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/gdm-plymouth-prime/ [3] https://aur.archlinux.org/pkgbase/gdm-prime/