Fails to compile with modern C

[NHOrus]

packet_manip.c:134:24: error: too many arguments to function ‘(int (*)(void))server->type->packet_func’
  134 |                 ret = ((int (*)())server->type->packet_func)(server, combined, datalen);
      |                       ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

That function cast needs full type definition

[NHOrus]

Or, alternatively, that cast is completely unneeded, and ret = (server->type->packet_func)(server, combined, datalen); works perfectly well.

[NHOrus]

Gentoo bug: https://bugs.gentoo.org/944360