Add Solaris build

[bep]

We need this to be merged to get file watching working: fsnotify/fsnotify#196

[maxmeyer]

@bep You might want to contact @dago. If he's still into OpenCSW, their build farm might help to build hugo on Solaris.

[bep]

@maxmeyer the problem isn't as much the building part; we got to get the code to work for Solaris first.

[bep]

This is now fixed upstream: fsnotify/fsnotify#371

[github-actions]

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