bug#49660: 28.0.50; json-available-p should exist

[Lars Ingebrigtsen]

All other libraries like this have an -available-p function, but not
json.c.

But json.c is slightly unusual in that it's not compiled at all if
jansson isn't available, so the function will have to go somewhere else,
which is rather, er, inconvenient.

Anybody have an idea how to solve that problem?


In GNU Emacs 28.0.50 (build 93, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, 
cairo version 1.16.0)
 of 2021-07-19 built on elva
Repository revision: b0c73439932eefb8302ec10c61d95ffcf2ef39be
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no