[aur-general] Deletion request: some mono packages

[Jekyll Wu]

All following packages are orphaned (for quite some time).

https://aur.archlinux.org/packages/monotorrent/     fail to build
https://aur.archlinux.org/packages/monsoon/         depend upon monotorrent
https://aur.archlinux.org/packages/monsoon-svn/     same as above

https://aur.archlinux.org/packages/openvpn-admin/   fail to patch
https://aur.archlinux.org/packages/mono-nat/        fail to build