jsondecode.cc: Handle array of arrays and arrays of structs correctly (bug #60688) * libinterp/corefcn/jsondecode.cc (decode_object_array): Resize struct array if it has no fields. * libinterp/corefcn/jsondecode.cc (decode_array_of_arrays): Handle struct arrays correctly. * test/json/jsondecode_BIST.tst: New tests. Many thanks to an anonymous contributor.

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