add #include "postgres.h", as required by all .c files

Marc G. Fournier <scrappy@hub.org>

Commit: 3df33180a182831c1f934edd1bf627152ab29aa4
Author: Marc G. Fournier <scrappy@hub.org>
Date: 1996-10-31T10:12:26Z
Releases: 7.1.1
add #include "postgres.h", as required by all .c files

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