fs/opendingux: system_info: List active network interfaces

This should help people who have trouble memorizing the Zero's IP
address and are not on a system where DNS-SD works.
Revert "libopk: Enable LZO support if liblzo is available"

This reverts commit 3a51abe44e402f5f79f0f10e4a74b4d06a45161a.

OPKs should never be LZO-compressed, so having LZO support has no
benefits and could lead to out-of-spec packages being accepted.
The LZO support in unsqfs.c is there in case someone wants to use
the code as a generic squashfs reader, outside the context of OPK.
unrar: Added package

Extractor for packages in RAR format.

http://www.rarlabs.com/