fix several FTBS on Solaris/Illumos
Fix several FTBS issues on Solaris/Illumos, eg. missing includes and linking standard libs.
@alanc could you please check whether it's okay on commercial Solaris ? (only have Illumos available right now).
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Fix several FTBS issues on Solaris/Illumos, eg. missing includes and linking standard libs.
@alanc could you please check whether it's okay on commercial Solaris ? (only have Illumos available right now).