unionfs: restore FD_* utility defines

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Author: Bruce Ashfield
Email: bruce.ashfield@windriver.com
Subject: unionfs: restore FD_* utility defines
Date: Tue, 21 Aug 2012 22:14:49 -0400

commit 27cd8f513 [posix_types.h: Cleanup stale __NFDBITS and related definition]
removes the defintions for:

 #define NFDBITS                        __NFDBITS

 #define FD_SETSIZE             __FD_SETSIZE
 #define FD_SET(fd,fdsetp)      __FD_SET(fd,fdsetp)
 #define FD_CLR(fd,fdsetp)      __FD_CLR(fd,fdsetp)
 #define FD_ISSET(fd,fdsetp)    __FD_ISSET(fd,fdsetp)
 #define FD_ZERO(fdsetp)                __FD_ZERO(fdsetp)

Which are still used by unionfs. We restore them to union.h for local use
by unionfs until full replacements are found.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
]

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>