Removed unknown gnat-2012 build switch.
Added required directory.
Merge branch 'master' of github.com:AdaHeads/call-flow-control
Merge branch 'master' of github.com:AdaHeads/call-flow-control
Merge branch 'master' of github.com:AdaHeads/call-flow-control
Call-flow depends on FreeSWITCH for starting.