Fix a typo.
(grafted from 8600a8cb38a63e557bd500f26b7d0f6c1f5a5559)

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extra : source : 8600a8cb38a63e557bd500f26b7d0f6c1f5a5559
Make the --exclude-nodump option always available, but ignored on non-Linux platforms. `cliapp` sometimes seems to complain if we don't include the option at all.
(grafted from 35556839875b27071cf4e085b99dea108c38957c)

--HG--
extra : source : 35556839875b27071cf4e085b99dea108c38957c