base-files: sysupgrade: do not rely on opkg to list changed conffiles
authorMatthias Schiffer <mschiffer@universe-factory.net>
Tue, 6 Mar 2018 07:25:32 +0000 (08:25 +0100)
committerMatthias Schiffer <mschiffer@universe-factory.net>
Wed, 7 Mar 2018 09:01:14 +0000 (10:01 +0100)
Many packages use the opkg conffiles field to list configuration files that
are to be retained on upgrades. Make this work on systems without opkg.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

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