testing luahbtex based lualatex-dev

[Karl Berry]

David and all,

    Date: Thu, 7 Nov 2019 21:48:10 +0000
    From: David Carlisle <d.p.carlisle at gmail.com>
    Subject: testing luahbtex based lualatex-dev

I've changed lualatex-dev to use luahbtex for its engine,
and committed luahbtex binaries for:
    i386-freebsd amd64-freebsd
    i386-linux x86_64-linux x86_64-linuxmusl
    i386-solaris x86_64-solaris
    x86_64-darwin x86_64-darwinlegacy
    win32

The above platforms are built by Mojca/Norbert/Akira's setups, and new
binaries will be committed if the (TL) sources are changed. No other
binaries will be changed in this way, only luahbtex.

Per the request, this is for testing of lualatex-dev based on luahbtex,
before the TL'20 release. We do not currently build any other
luahbtex-based formats (though if anyone wants them, we could).

After the TL'20 release, luahbtex will be built and updated as usual,
i.e., hopefully not at all, and we'll include a plain luahbtex.fmt.

The following platforms currently have no luahbtex binary, and
consequently no lualatex-dev format:
  aarch64-linux
  armhf-linux
  i386-netbsd amd64-netbsd
  i386-cygwin x86_64-cygwin

If we're lucky, this will all happen with tonight's update.
More likely, it will take a day or two to fix whatever goes wrong.

Happy testing,
Karl