The "make tgz" target is renamed to "make sourcepkg", so the command doesn't have to change again if the compression method does. "make tgz" was a bad, ambiguous name anyway, because it doesn't make clear that the sources are packed, not binaries.
Renamed build_tgz.sh → make_sourcepkg.sh, because all other files in this directory are called make_something.
2.80 release sources: 52 → 36 MB (-31%)