Fix up com_err initialization for FreeBSD
The symbol needs to be defined in the ARPA2Common library (or linking will fail for consumers of the utils library that use that part of the API), but the body of arpa2comerr_init()
is nonsense on FreeBSD: you can't get at the non-exported, mutex-guarded initialization of the internal et_list
.
Edited by Adriaan de Groot