Tighten up includes in sinvaladt.h, twophase.h, proc.h

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

Commit: 77ed0c69504aad141dea314b1de261195aae5c9e
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2012-06-25T22:40:40Z
Releases: 9.3.0
Tighten up includes in sinvaladt.h, twophase.h, proc.h

Remove proc.h from sinvaladt.h and twophase.h; also replace xlog.h in
proc.h with xlogdefs.h.

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