opkg upgrade should "autoremove" unused #1731

[Tick Chen]

It's seems the buzilla failed in CC, so I send directly. 

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Hi Holger,

    I had created a patch about removing the orphan auto-installed
packages, but I cannot find a real case in our repository.

https://docs.openmoko.org/trac/attachment/ticket/1731/07_remove_orphan_depend.patch

Would you like to test this for me? If that works for you, then I will
commit the patch.

Cheers,
Tick 
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