net/boinc-client: make LINUX option a default or Slave port?

[Torfinn Ingolfsen]

Update:
it appears that the /usr/local/etc/rc.d/boinc-client script isn't
working correctly with the new version of the boinc_client.

root at kg-vm# service boinc-client status
boinc_client is not running.
root at kg-vm# cat /var/run/boinc_client.pid
11854
root at kg-vm# ps ax | grep boinc_client
11853  -  Ss        0:00.68 /usr/local/bin/boinc_client --daemon --dir
/var/db/boinc
12123  0  S+        0:00.00 grep boinc_client

No, I do not know why the process that's recorded in the pid file dies
/ is killed.
Details:
root at kg-vm# uname -a
FreeBSD kg-vm.kg4.no 10.3-STABLE FreeBSD 10.3-STABLE #0 r311695: Sun
Jan  8 20:58:02 CET 2017
root at kg-vm.kg4.no:/usr/obj/usr/src/sys/GENERIC  amd64
root at kg-vm# pkg info boinc*
boinc-client-7.2.33_7
boinc_curses-0.2.2_1

HTH
-- 
Regards,
Torfinn Ingolfsen