bug#48228: json-serialize should signal error when dll is not found [MS Windows]

[Robert Pluim]

>>>>> On Tue, 4 May 2021 19:10:27 +0300, Dmitry Gutov <dgutov@yandex.ru> said:

    Dmitry> On 04.05.2021 19:08, Eli Zaretskii wrote:
    >> An alternative to signaling an error would be to provide a
    >> json-avail-p functon which applications could test.  That would be
    >> similar to what we do with other libraries, like image libraries and
    >> GnuTLS.

    Dmitry> That's an option.

    Dmitry> I'd rather we chose a less error-prone approach, though. No pun 
intended.

What makes it error-prone? Those existing testing functions (on
Windows) attempt to load the relevant DLL's using the exact same
mechanisms as the actual code, so the failure (and success) modes are
identical.

Robert
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