fs/poll:  More typo fixes.  Now I understand.  It was not really being built in the configuration that I was using

Fix unecessary delays and timing jitter in the implementation of poll(): No delay if timeout is zero; If timeout is greater than zero, first check if events are already pending events before starting the delay.  From Johannes Hampel

Completes the implemenation of the core shared memory logic:  shmget(), shmctl(), shmat(), and shmdt().  This is still some unfinish platform-specific code that needs to be done before we can begin testing.