Replace direct inclusions of c.h with inclusion of postgres.h,

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 21badba151f12fe80921c2791772482d00f728d2
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1999-01-17T03:04:57Z
Releases: 7.1.1
Replace direct inclusions of c.h with inclusion of postgres.h,
to ensure that config.h is included as well.

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