3.20.0 itself has been in tree since November, only changes are gumbo subslot and dropped libcanberra for this branch. This will allow cleaning of older 3.* versions and libcanberra[gtk2]
arm64 done
ppc64 done
ppc done
arm done
amd64/x86 also done in e23f8ff81a19ed28c17a2ad088889b1c179e4e5e, all done! Thanks sam