* Update .editorconfig so my Emacs doesn't add tabs into the YAML files
anymore
* The UPX version in ubuntu doesn't use the NRV library and seems to be
a bit buggier. Furthermore, UPX is GPL and they allow an exception
only if the binary is compressed with the official build. The latter
is not really a problem, nobody will care, but the worse compression
and potential crashes are. So just use the official build for Linux.
Windows was already using it, but to keep it consistent with
UPX_VERSION we now also download it instead of using Chocolatey.
Dennis Brakhane
98dfd7f589