infozip: remove package (earlier name: zip)

infozip: remove package (earlier name: zip)

Infozip (earlier name "zip") has 12 year old source code that
would require work to make the binary actually work.

> root@router1:/# zip
> zip error: Not supported (uzoff_t not same size as zoff_t)

The package was rename from zip to infozip a few weeks ago
due to buildbot's relutance to compile zip in master and 19.07
ever since host zip was added as a build tool.

Reference to #10985 and #11089 as well as
https://github.com/openwrt/openwrt/commit/ad8c2d6099a7da5192ee6e2c52a8303642271877

But as the binary does not work, lets remove the package to
avoid confusion for the end-users.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>