Bring several fixes from FreeBSD to our current pipe implementation:

- when allocating or growing a pipe buffer is not possible, do not panic
  but report the error and handle it correctly. (1.73)
- "The pipe_write() code was locking the pipe without busying it first
  in certain cases, and a close() by another process could potentially rip
  the pipe out from under the (blocked) locking operation." (from Al Viro,
  1.81)
- "Remove test in pipe_write() which causes write(2) to return EAGAIN
  on a non-blocking pipe in cases where select(2) returns the file
  descriptor as ready for write. This in turns causes libc_r, for
  one, to busy wait in such cases.
  Note: it is a quick performance fix, a more complex fix might be
  required in case this turns out to have unexpected side effects."
  (1.141)

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