Remove duplicate or unused includes

In PG12 relation.h will be renamed pathnodes.h, remove it
if it's not needed.

In PG12 tqual.h is no more.

src/chunk_adaptive.c

@@ -13,7 +13,6 @@
 #include <utils/builtins.h>
 #include <utils/array.h>
 #include <utils/snapmgr.h>
-#include <utils/tqual.h>
 #include <utils/typcache.h>
 #include <funcapi.h>
 #include <math.h>

src/chunk_append/planner.c

@@ -9,7 +9,6 @@
 #include <nodes/extensible.h>
 #include <nodes/makefuncs.h>
 #include <nodes/nodeFuncs.h>
-#include <nodes/relation.h>
 #include <optimizer/clauses.h>
 #include <optimizer/pathnode.h>
 #include <optimizer/paths.h>

src/chunk_append/transform.c

@@ -8,7 +8,6 @@
 #include <catalog/pg_type.h>
 #include <nodes/makefuncs.h>
 #include <nodes/nodeFuncs.h>
-#include <nodes/relation.h>
 #include <optimizer/clauses.h>
 #include <utils/lsyscache.h>
 

src/chunk_insert_state.c

@@ -11,7 +11,6 @@
 #include <utils/builtins.h>
 #include <utils/guc.h>
 #include <nodes/plannodes.h>
-#include <nodes/relation.h>
 #include <access/xact.h>
 #include <optimizer/plancat.h>
 #include <optimizer/clauses.h>

src/hypertable_insert.c

@@ -10,7 +10,6 @@
 #include <nodes/makefuncs.h>
 #include <nodes/nodeFuncs.h>
 #include <nodes/plannodes.h>
-#include <nodes/relation.h>
 #include <executor/nodeModifyTable.h>
 #include <utils/rel.h>
 #include <utils/lsyscache.h>

src/hypertable_restrict_info.c

@@ -4,7 +4,6 @@
  * LICENSE-APACHE for a copy of the license.
  */
 #include <postgres.h>
-#include <nodes/relation.h>
 #include <utils/typcache.h>
 #include <optimizer/clauses.h>
 #include <utils/lsyscache.h>

src/plan_expand_hypertable.c

@@ -4,7 +4,6 @@
  * LICENSE-APACHE for a copy of the license.
  */
 #include <postgres.h>
-#include <nodes/relation.h>
 #include <parser/parsetree.h>
 #include <optimizer/clauses.h>
 #include <optimizer/var.h>

src/planner.c

@@ -5,7 +5,6 @@
  */
 #include <postgres.h>
 #include <nodes/plannodes.h>
-#include <nodes/relation.h>
 #include <parser/parsetree.h>
 #include <optimizer/clauses.h>
 #include <optimizer/planner.h>

src/scanner.c

@@ -9,7 +9,6 @@
 #include <storage/lmgr.h>
 #include <storage/bufmgr.h>
 #include <utils/rel.h>
-#include <utils/tqual.h>
 
 #include "scanner.h"
 

src/scanner.h

@@ -12,7 +12,6 @@
 #include <access/heapam.h>
 #include <nodes/lockoptions.h>
 #include <utils.h>
-#include <access/relscan.h>
 
 #include "export.h"