[Patch] Ensure DELL_WCTL is always defined in the callout

[Sjoerd Simons]

Hi,

  The hal-system-killswitch-get-power-linux gives an error with certain shells
  when the access method is not dell.. See the patch for details :)

  Ok to commit?

  Sjoerd
-- 
Wisdom is knowing what to do with what you know.
		-- J. Winter Smith
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