Add missing POSIX O_CLOFORK

[Matthew Dillon]

Ok, it looks fairly straight-forward.   A great deal of work on your part,
we really appreciate it!
The only question I have is about this line in fsetfdflags():

fdp->fd_files[fd].fileflags = set_flags & 0x7f;

What is the mask for?  fileflags is a char field more or less but if all
you are doing is getting rid of a compiler warning that should probably be
a cast instead of a masking operation, with a comment explainer.

-Matt
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