[Rpm-maint] [rpm-software-management/rpm] Set v6 default payload compression to w19.zstdio (PR #3483)

[Panu Matilainen]

@pmatilai commented on this pull request.



>  #		"w.ufdio"	uncompressed
 #
 #%_source_payload	w9.gzdio
-#%_binary_payload	w9.gzdio
+%_binary_payload	%[ %_rpmformat >=6 ? "w19.zstdio" : "w9.gzdio" ]

You'd be surprised how much people expect to do just that sort of thing. 
But it's not so much about compatibility, and more about just not being worth it: source tarballs are practically always compressed already and burning extra cpu on a better compression algorithm isn't going to make the damnest of differences. That's why nobody updated it for v4 either, whereas for binaries nobody used gzip for ages.

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