TeXLive binaries for `darwinlegacy'

[Werner LEMBERG]

> - It's nice to still support 10.6 as long as we can do that without
>   too much hassle.

Yep.

> Are you willing to test whether
>     http://dl.contextgarden.net/build/texlive/x86_64-darwinlegacy.tar.xz
> finally works?
> 
> If it does, I'll use the same settings to build from the 2019 branch
> and commit the two problematic binaries to SVN.

My first quick test was to rebuild all formats, and this worked just
fine, so please commit!


    Werner