Test failures on MinGW about jansson

[minq-park-lge]

@akheron
I'm using 2.10.0 version but this issue also occurs.
Is this known issue ?

    json_t *json_common = json_pack("{sIsssssssi}",
            "mid", (json_int_t)get_message_id(),
            "did", get_device_id(),
            "kind", get_kind(),
            "cmd", cmd,
            "rssi", g_rssi_for_log
            );

sign problem on rssi field

{"success":false,"message":"Fail to parse a message : cannot parse json body:Failed to decode: Unexpected character ('4' (code 52)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value\n at [Source: {\"mid\": 79698547, \"did\": \"3f3f0aa0-b881-1dcf-b546\", \"kind\": \"RAC_056905_WW\", \"cmd\": \"req_timesync\", \"rssi\": +46, \"data\": null, \"type\": 1}; line: 1, column: 124]"}    

leading zero problem on mid field

 {\"mid\":0100100010,\"did\":\"20eb20d2-448e-124\",\"kind\":\"1WPU4C0FFR__2\",\"cmd\":\"device_packet\",\"rssi\":-11,\"data\":\"AA0A12E2E1010258B1BB\",\"type\":1}