some xtimer error's in radio.c

[Alex1Avad]

radio.c: In function '_file_start_thread':
radio.c:171:27: error: request for member 'ticks32' in something not a structure or union
171 | start_time = xtimer_now().ticks32;
| ^
radio.с: In function 'processPacket':
radio.c:324:35: error: request for member 'ticks32' in something not a structure or union
324 | uint32_t now_time = xtimer_now().ticks32;