1. Hide the internals of struct fd_set in standard namespaces. 2. Avoid referencing bcopy() and bzero(), since they may not be in    scope.
1. Hide the internals of struct fd_set in standard namespaces.
2. Avoid referencing bcopy() and bzero(), since they may not be in
   scope.

Request by:     bde (1)
Submitted by:   wollman (2)
Reviewed by:	archie, bde
PR:		43270

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