This reverts commit a488998d.

Ups. This should have been in master.

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.

Fixes: turris/turris-os-packages#384

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.

Upstream disabled requirement for libbsd so we can drop this patch.

This makes old version to be same as our up to now but it should not
break anything and I epxect that our build bumper is going to bump it
because ABI will be different.

Upstream might have fixed this in:
d02a17b35bb8105a208422797c99242520650f12