Modify interactions between sinval.c and sinvaladt.c. The code that actually

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: ec6550c6c06ba3a0cf4df31d1016aa8eb8716ddb
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-03-16T19:47:34Z
Releases: 8.4.0
Modify interactions between sinval.c and sinvaladt.c.  The code that actually
deals with the queue, including locking etc, is all in sinvaladt.c.  This means
that the struct definition of the queue, and the queue pointer, are now
internal "implementation details" inside sinvaladt.c.

Per my proposal dated 25-Jun-2007 and followup discussion.

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