Irssi Devel 0.8.17rc1

For some reason, for a while now apparently, we’ve been pointing at an Irssi devel build that 1) was a snapshot, 2) seemed to have a very unstable checksum. This moves the devel build to a more stable but still developmental release and subsequently hopefully a more stable checksum. Ideally, this should be merged after my OpenSSL proposal has been accepted or rejected.