Peter Wemm 6ee78bf046 Make pipe() return a set of bidirectional pipe fd's rather than one-way only
just like on SVR4.

This has no effect on any current programs in our source, but makes
the use of SVR4 code a little easier.  There is no code or implementation
cost in the kernel.. This two-line change merely sets the modes on the ends
of the pipes to be bidirectional.  There are no other changes.
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