[aur-requests] [PRQ#18601] Deletion Request for libmatemixer-dev

LothaireFR [1] filed a deletion request for libmatemixer-dev [2]: Since then MATE 1.24 has released. In fact, we do have here a download file to build a 4 years old package. Way newer version in the Arch repos [1] https://aur.archlinux.org/account/LothaireFR/ [2] https://aur.archlinux.org/pkgbase/libmatemixer-dev/