added missing fallthru in case statement for linux option, fixes #221, #222
added missing fallthru in case statement for linux option, fixes #221, #222

suma/packer,patricklucas/packer,Kaixiang/packer,Kaixiang/packer,TranscendComputing/packer,TranscendComputing/packer,patricklucas/packer,TranscendComputing/packer,suma/packer,suma/packer,patricklucas/packer,Kaixiang/packer,Kaixiang/packer,TranscendComputing/packer,suma/packer,patricklucas/packer