`disabledFilesDefault` files have failing tests that should be fixed

[timotheecour]

#10044 which was just merged exposed failing tests that should be fixed:

const disabledFilesDefault = @[
  "LockFreeHash.nim",
  "sharedstrings.nim",
  "tableimpl.nim",

  # Error: undeclared identifier: 'hasThreadSupport'
  "ioselectors_epoll.nim",
  "ioselectors_kqueue.nim",
  "ioselectors_poll.nim",

  # Error: undeclared identifier: 'Timeval'
  "ioselectors_select.nim",
]

[stale]

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[metagn]

These are just include files now that testament doesn't want to compile by itself. I don't see an issue.