Allow each C include file to compile on its own by including any needed

Bruce Momjian <bruce@momjian.us>

Commit: b85a965f5fc7243d0386085e12f7a6c836503b42
Author: Bruce Momjian <bruce@momjian.us>
Date: 2006-07-11T13:54:25Z
Releases: 8.2.0
Allow each C include file to compile on its own by including any needed
header files.

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