bug#42181: 28.0.50; jansson library not available in Emacs 28.0.50 snapshot 2020-06-26 64-bit Windows installer

[Stefan Kangas]

Richard Day <r.day80@gmail.com> writes:

> 1. Start emacs with 'emacs -Q'
> 2. M-x eval-expression (json-serialize '()) RET
> 3. Switch to *Messages* buffer, note message 'jansson library not found'
>
> The jansson library is required for native JSON support which is
> required for lsp-mode.  Without the library, lsp-mode does not work
> correctly, specifically with clangd for C++ development.
>
> Copying libjansson-4.dll from another project (e.g. mingw64) into the
> bin directory and restarting emacs restores lsp-mode functionality.
>
> It would seem that libjansson*.dll is missing from the Windows installer.

Phillip, is this also related to Bug#42199, i.e. something which is
being worked on elsewhere?  Should this bug be kept open or will it be
addressed as part of that separate work?  Thanks.

Best regards,
Stefan Kangas