Let's hope that this fixes problems with kernel 4.19 compilation.

In Turris OS 3.x opkg was the package containing
/etc/opkg/distfeeds.conf. This file with TOS 4.0+ was moved by upstream
to base-files. This means hat we also have to move postinst for that
file update to base-files from opkg package. This should fix OPKG feeds
being reseted by update.

This is backport of change done in OpenWRT master. We need this to be
consistent in target name in packages.

This should help us to debug system configuration better to see what
exactly was targeted version. This also helps users to see what they are
dealing with. It in some sense informs them if they are upgrading to new
version or if that is just packages change (because of configuration
change) in same release.

These are list aliases and we have them here so users with TOS 4.0-beta1
can update to future releases. With some future release we can revert
this commit and that way drop this. It does not have to exist for long
time after final release or even before it.

These are special lists intended to be used with contractors.

Fixes: turris/turris-os-packages#384

I don't see a reason why we should exclude usb2 from base installation.
It is hardware support and all our devices do have usb ports so let's
support them in default in their completeness.

This reverts commit aed57671.

base-files are providing now files that were originally provided by
other packages so it fails to install.

The same patch was applied by someone else in upstream

Even OpenWrt 18.06 should be feature frozen and receive just security updates together with bug fixes, but there was added rpcbind.