Move ProcState definition into sinvaladt.c from sinvaladt.h, since it's not

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

Commit: 23057f51f5c1bb1bcb93bd2879eefd9ceec1d744
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-03-17T11:50:27Z
Releases: 8.4.0
Move ProcState definition into sinvaladt.c from sinvaladt.h, since it's not
needed anywhere after my previous patch.  Noticed by Tom Lane.

Also, remove #include <signal.h> from sinval.c.

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