[aur-general] Merge request for [last.fm]

[Evan Teitelman]

Please merge last.fm[1] into lastfm[2].

Both packages provide the same tool. The last.fm package is unmaintained and
its PKGBUILD file is a mess.

[1] https://aur.archlinux.org/packages/last.fm/
[2] https://aur.archlinux.org/packages/lastfm/