Remove Solaris support

[djberg96]

It's sad, I know, since Sun Microsystems used to be a great company. That is, until that pony-tailed dipshit Jonathan Schwartz took over the place and wrecked it. Then Oracle bought the company, and in 2017 laid off the Solaris engineers, and the roadmap for Solaris 12 was defunct. The last release of Solaris was 11.4 in 2018.

While it's still technically supported until 2037, the reality is that its market share at this point is negligible and it isn't worth maintaining any more, especially since I have no real way to test it now. For those few souls out there still using Solaris and this gem, you'll simply have to either pin to version 1.3.0, or fork the project and do your own thing.

Leaving open for now since I'm having some issues with my desktop system that I use for Windows releases, but the end of Solaris support is nigh.