JSON_ENC: Fix unit test for MSVC

JSON_ENC: Fix unit test for MSVC

Previously scripts were defined like this:

    {
        static const char *const script_name = "xxx";

        static const struct script_info script_info = {
            script_name, ...
        };

        return &script_info;
    }

MSVC cannot handle this, presumably because this technically involves a
load from a variable to determine that script_name equals "xxx" and it
is unable to do this during evaluation of a constant initializer list.
Resolve this by changing script_name and script_title to be arrays
instead, allowing the correct pointer values to be filled into
script_info as symbol addresses/relocations rather than dereferences.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23517)