[PRQ#51217] Deletion Request for mingw-w64-libevent

MarsSeed [1] filed a deletion request for mingw-w64-libevent [2]: Clean of unmaintained, but unneeded library, after deleting its defunct, unused consumer from 2015 with missing source: mingw-w64-ccnet (PRQ#51186). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/mingw-w64-libevent/