I found the patch that breaks Screamer sound support for qemu-system-ppc. It is 
this:

commit 2ceb8240fa4e4e30fb853565eb2bed3032d74f62
Author: Kővágó, Zoltán <dirty.ice...@gmail.com>
Date:   Thu Sep 19 23:24:11 2019 +0200

    coreaudio: port to the new audio backend api
    
    Signed-off-by: Kővágó, Zoltán <dirty.ice...@gmail.com>
    Message-id: 
586a1e66de5cbc6c5234f9ae556d24befb6afada.1568927990.git.dirty.ice...@gmail.com
    Signed-off-by: Gerd Hoffmann <kra...@redhat.com>


Reversing this patch should make the Screamer patch work with the current git 
version of QEMU.

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