LibBSD | Add poll() and select() support for pipe (#39)

[Ning Yang (@yangn0)]

Ning Yang created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/39



The pipe requires poll and select support. I suppose some `SYSINIT` is needed like this commit. https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/commit/045ff6e11cf21454c6216a1099b44a6fe692586f

```c
puts( "Init - create pipe -- OK" );
status = pipe( fd );
assert( status == 0 );

struct pollfd pfd = {
  .fd = fd[1],
  .events = POLLIN
};
int n=poll(&pfd,1,-1);
printf("pfd.revents: %d",pfd.revents);
```
The `pfd.revents` is 8. 
It means POLLHUP,
```
The  device  or socket has been disconnected.  This flag
is always	checked, even if not  present  in  the	events
bitmask.	 Note that POLLHUP and POLLOUT should never be
present in the revents bitmask at	the same time.
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/39
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