This fixes

  In file included from dlls/nsiproxy.sys/tcp.c:70:
  /usr/include/libprocstat.h:130:36: error: 'SPECNAMELEN' undeclared here
  130 |         char            vn_devname[SPECNAMELEN + 1];

on FreeBSD 11 and presumably other targets.
Signed-off-by: Gerald Pfeifer <gerald@pfeifer.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>