Andrew Tridgell 068a862982 much cleaner chain pointer handling for both files and pipes. ...

the chain pointer is now stored as a static and is set whenever a
handle is created or extracted. This also makes the code less error
prone.

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locking_shm.c

this checkin gets rid of the global Files[] array and makes it local

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locking_slow.c

fixed some bugs in the locking_slow code caused by the recent changes.

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locking.c

much cleaner chain pointer handling for both files and pipes.

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shmem_sysv.c

configure: Changes for extra headers.

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shmem.c

configure: Changes for extra headers.

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