Revert "Add xeno to expected test failures per ocramz/xeno#37"
Revert "Add xeno to expected test failures per ocramz/xeno#37"

This reverts commit dbdc2ea715d280a2cccd1555662a094c44b239ff.

mrkkrp/stackage,simonmichael/stackage,fpco/stackage,jonschoning/stackage,athanclark/stackage,Daniel-Diaz/stackage,massysett/stackage,stackbuilders/stackage,asr/stackage,iand675/stackage,soenkehahn/stackage,michalkonecny/stackage,clinty/stackage