maketgz: switch to xz instead of lzma #1604
The daily snapshots stopped being built shortly after this was committed. Coincidence?
And on an unrelated note, the tradeoff for using xz -9 is much worse than for gzip. It drastically increases the amount of RAM required for decompressing, without improving compression for smaller-sized files. The docs say "it is good to avoid using the presets -7 ... -9 when there's no real need for them."