Fix #2717: Complete POSIX errno.scala by providing errno variable #2721
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This PR can trigger the need for source code changes so it should be on the 0.5.0 track.
TL; DR
This PR completes POSIX errno.scala by supplying the previously missing errno variable.
Discussion
To be supplied.
Life got complicated when CI revealed Scala 2.11.n & 2.12.n 'features`