Remove superfluous tqual.h includes.

Most of these had been obsoleted by 568d4138c / the SnapshotNow
removal.

This is is preparation for moving most of tqual.[ch] into either
snapmgr.h or heapam.h, which in turn is in preparation for pluggable
table AMs.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de

src/backend/commands/alter.c

@@ -66,7 +66,6 @@
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 static Oid	AlterObjectNamespace_internal(Relation rel, Oid objid, Oid nspOid);

src/backend/commands/comment.c

@@ -28,7 +28,6 @@
 #include "utils/builtins.h"
 #include "utils/fmgroids.h"
 #include "utils/rel.h"
-#include "utils/tqual.h"
 
 
 /*

src/backend/commands/dbcommands.c

@@ -61,7 +61,6 @@
 #include "utils/pg_locale.h"
 #include "utils/snapmgr.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 typedef struct

src/backend/commands/event_trigger.c

@@ -45,7 +45,6 @@
 #include "utils/lsyscache.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
-#include "utils/tqual.h"
 #include "utils/syscache.h"
 #include "tcop/utility.h"
 

src/backend/commands/extension.c

@@ -63,7 +63,6 @@
 #include "utils/memutils.h"
 #include "utils/rel.h"
 #include "utils/snapmgr.h"
-#include "utils/tqual.h"
 #include "utils/varlena.h"
 
 

src/backend/commands/functioncmds.c

@@ -71,7 +71,6 @@
 #include "utils/rel.h"
 #include "utils/syscache.h"
 #include "utils/typcache.h"
-#include "utils/tqual.h"
 
 /*
  *	 Examine the RETURNS clause of the CREATE FUNCTION statement

src/backend/commands/indexcmds.c

@@ -62,7 +62,6 @@
 #include "utils/regproc.h"
 #include "utils/snapmgr.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 /* non-export function prototypes */

src/backend/commands/opclasscmds.c

@@ -49,7 +49,6 @@
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 static void AlterOpFamilyAdd(AlterOpFamilyStmt *stmt,

src/backend/commands/proclang.c

@@ -38,7 +38,6 @@
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 typedef struct

src/backend/commands/seclabel.c

@@ -24,7 +24,6 @@
 #include "utils/fmgroids.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
-#include "utils/tqual.h"
 
 typedef struct
 {

src/backend/commands/tablecmds.c

@@ -98,7 +98,6 @@
 #include "utils/ruleutils.h"
 #include "utils/snapmgr.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 #include "utils/typcache.h"
 
 

src/backend/commands/tablespace.c

@@ -81,7 +81,6 @@
 #include "utils/lsyscache.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
-#include "utils/tqual.h"
 #include "utils/varlena.h"
 
 

src/backend/commands/trigger.c

@@ -58,7 +58,6 @@
 #include "utils/rel.h"
 #include "utils/snapmgr.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 #include "utils/tuplestore.h"
 
 

src/backend/commands/tsearchcmds.c

@@ -46,7 +46,6 @@
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 static void MakeConfigurationMapping(AlterTSConfigurationStmt *stmt,

src/backend/commands/user.c

@@ -37,7 +37,6 @@
 #include "utils/fmgroids.h"
 #include "utils/syscache.h"
 #include "utils/timestamp.h"
-#include "utils/tqual.h"
 
 /* Potentially set by pg_upgrade_support functions */
 Oid			binary_upgrade_next_pg_authid_oid = InvalidOid;

src/backend/commands/vacuum.c

@@ -50,7 +50,6 @@
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/syscache.h"
-#include "utils/tqual.h"
 
 
 /*