mount command outputs its usage on correct arguments

[Dario Bertini]

BusyBox v1.21.1-jb bionic (2013-07-25 21:23 +0100) multi-call binary.

I think the .config should be this one:
https://github.com/tpruvot/android_external_busybox/blob/cm-10.1/.config-full

Thanks

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