Add #include code to prevent multiple inclusion.

Bruce Momjian <bruce@momjian.us>

Commit: f0cd7647234b028d25cfd53c9376320e0ef9799b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2006-07-10T21:03:58Z
Releases: 8.2.0
Add #include code to prevent multiple inclusion.

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