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The PipeFS dynamic area was being created with AP 0, granting usermode
full read/write/execute access. Attempt to restrict it to just the
minimum required permissions - privileged read/write for PipeFS access,
and usermode read for TaskWindow (or other potential UpCall_Sleep
handlers) checking pollwords.

This isn't an ideal situation, both because we're exposing the contents
to everyone, and because systems which are using the long descriptor
page table format will be forced to use the kernel's AP1 emulation to
provide usermode read access, adding unnecessary overhead to pollword
checks.

Moving the pollwords to the RMA could be one solution to this (although
it will re-introducing the possibility for user code to scribble on
them)

Version 0.25. Tagged as 'PipeFS-0_25'