Fix builds with new json-parser on i686

Since one of commit [0] we can't build tee on i686 systems.

[0] https://github.com/udp/json-parser/commit/d91f8047ee5081b67f4a2a6cfefd954ebf1fd56b

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>