[PRQ#51214] Deletion Request for mingw-w64-seafile-shared

MarsSeed [1] filed a deletion request for mingw-w64-seafile-shared [2]: Broken, abandoned library and daemon pkg from 2015. Its AUR/mingw-w64-ccnet dependency is similarly old, and its source and upstream repo has been removed from GitHub (404). There's an active deletion request for the latter: PRQ#51186 It's safe to drop this unused and unusable package as well. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/mingw-w64-seafile-shared/