Long time ago, IRIX was way ahead of its time in the last century with
its SMP capabilities of scaling up to 1024 processors and other features
such as XFS or OpenGL that originated in IRIX and live on to this day in
other operating systems.

However, IRIX's last software update was in 2006 and support ended
around 2013 according to [1], so it's considered an extinct platform by
now. So this commit message is effectively an obituary for GHC's IRIX
support.

R.I.P. IRIX

 [1]: https://en.wikipedia.org/wiki/IRIX