[PRQ#50993] Deletion Request for libsidplay

[notify]

MarsSeed [1] filed a deletion request for libsidplay [2]:

Discontinued since 2004, fails to build.
Not useful to keep.

[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/libsidplay/