Drop limit on stack size via systemd

Setting the 240k hard limit here is too aggressive and causes FS to
crash on startup.

debian/freeswitch-systemd.freeswitch.service

@@ -21,7 +21,7 @@ Group=freeswitch
 LimitCORE=infinity
 LimitNOFILE=100000
 LimitNPROC=60000
-LimitSTACK=240
+;LimitSTACK=240
 LimitRTPRIO=infinity
 LimitRTTIME=7000000
 IOSchedulingClass=realtime