The current approach (creating a blocker file) is clumsy. Use a variable
in /etc/default/freeswitch instead.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

- Use "-nc -nf" always. When started by procd freeswitch detects the
  console to be orphaned and disables it. So disable the interactive
  console but force freeswitch to not fork into background.
- Improve readability of command parameters.
- Minor changes.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

 - FreeSWITCH stable series for OpenWrt/LEDE
 - clean, simple Makefiles
 - provides 'freeswitch' user on target device, no need for root
 - procd init script
 - musl and glibc support
 - SHA256 for download verification
 - hotplug script with extras (condition checks)
 - package size reduced

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>