Mk/bsd.sites.mk: Remove stale links
- https://ftp.heanet.ie/pub/mozdev/ no longer hosts the subdirectory
- https://mirrors.sunsite.dk/qmailwww/ no longer hosts the subdirectory
- https://tor.myrl.net/dist/ does not resolve
- https://www.torservers.net/mirrors/torproject.org/dist/ no longer hosts the subdirectory
Approved by: portmgr (blanket)