Initial problem description:
    
    I have an application that optionally can use kernel async IO (libaio.so).
    As this is optional, I don't want to link the application with -laio, as
    otherwise all users have to install libaio RPM.
    
    Therefore, I'm loading libaio.so at runtime via dlopen(), and get the
    required function addresses via dlvsym(). Basically, I need io_queue_init(),
    io_submit(), and io_getevents().
    
    This works fine on all supported platforms except IA64.
    
    It turns out the __ia64_raw_syscall macro did not include a .proc directive,
    which was causing this problem.  The fix is to simply add a one line
    change to that macro.