qsort_r in jitqueue.c can be changed to qsort_s for Alpine?

[sbiermann]

Hi, as reported here: https://github.com/jpmeijers/ttn-resin-gateway-rpi/issues/10, i can not build a alpine docker image in case of qsort_r is not implemented in Alpine Linux. It seems that is the last point which needs to be changed for building an Alpine docker image. Is it possible to change it to a supported qsort in Alpine (qsort_s for example)? Kind regards Stefan