Remove unused, redundant header files.

src/include/access/giststrat.h

-/*-------------------------------------------------------------------------
- *
- * giststrat.h
- *	  routines defined in access/gist/giststrat.c
- *
- *
- *
- * rtstrat.h,v 1.2 1995/02/12 02:54:51 andrew Exp
- *
- *-------------------------------------------------------------------------
- */
-#ifndef GISTSTRAT_H
-#define GISTSTRAT_H
-
-#include "utils/rel.h"
-
-extern StrategyNumber RelationGetGISTStrategy(Relation r,
-						AttrNumber attnum, RegProcedure proc);
-
-#endif	 /* GISTSTRAT_H */

src/include/access/rtstrat.h

-/*-------------------------------------------------------------------------
- *
- * rtstrat.h
- *	  routines defined in access/rtree/rtstrat.c
- *
- *
- * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * $Id: rtstrat.h,v 1.13 2001/01/24 19:43:19 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-#ifndef RTSTRAT_H
-#define RTSTRAT_H
-
-#include "utils/rel.h"
-
-extern RegProcedure RTMapOperator(Relation r, AttrNumber attnum,
-			  RegProcedure proc);
-
-#endif	 /* RTSTRAT_H */