[jackd] add support for slave drivers into jackd executable
[jackd] add support for slave drivers into jackd executable

cant pass parameters to slave drivers yet.
this is similar to jack2 for now.

git-svn-id: 9d792367086e53bac42cb25f723fe47762daf29a@4399 0c269be4-1314-0410-8aa9-9f06e86f4224

ventosus/jack1,drobilla/jack1,drobilla/jack1,drobilla/jack1,ventosus/jack1,drobilla/jack1,ventosus/jack1,ventosus/jack1