ignore soundmodem.conf
autoconf seems to want configure.in to be called configure.ac
no more "extern inline", because it causes symbol conflicts during link time
only call sched_setscheduler if the function is defined
fix LLVM warnings & errors
remove pammodem

I only care about pskmodem right now, so don't try and get pammodem working
link with CoreAudio and stub out related functions
cut ALSA for now

can't figure out how to handle this on OS X, so cutting it from autoconf and will deal with it later