lists/base-fix.lua: add ABI change fix for libubus

This new version of libubus changed its API and so updater has to
reinstall all packages depending on it.

lists/base-fix.lua.m4

+-- Fixes and hacks to migrate from older setups
+
+-- ABI changed in libubus with version 2019-12-27
+if not version_match or not installed or
+		(installed["libubus"] and version_match(installed["libubus"].version, "<2019-12-27")) then
+	Package("libubus", { abi_change = true })
+end

lists/base-min.lua.m4

 include(utils.m4)dnl
 include(repository.m4)dnl
 
+list_script('base-fix')
+
 -- Updater itself
 Install('updater-ng', 'updater-supervisor', { critical = true })
 Package('updater-ng', { replan = 'finished' })