Fix nbtree's failure to clear BTScans list during xact abort.

Also, move responsibility for calling vc_abort into main xact.c list of
things-to-call-at-abort.  What in the world was it doing down inside of
TransactionIdAbort()?

src/backend/access/transam/transam.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.30 1999/07/15 23:03:02 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.31 1999/08/08 20:12:52 tgl Exp $
  *
  * NOTES
  *	  This file contains the high level access-method interface to the
@@ -20,7 +20,6 @@
 
 #include "access/heapam.h"
 #include "catalog/catname.h"
-#include "commands/vacuum.h"
 
 static int	RecoveryCheckingEnabled(void);
 static void TransRecover(Relation logRelation);
@@ -83,12 +82,6 @@ int			RecoveryCheckingEnableState = 0;
  */
 extern int	OidGenLockId;
 
-/* ----------------
- *		globals that must be reset at abort
- * ----------------
- */
-extern bool BuildingBtree;
-
 
 /* ----------------
  *		recovery checking accessors
@@ -568,11 +561,6 @@ TransactionIdCommit(TransactionId transactionId)
 void
 TransactionIdAbort(TransactionId transactionId)
 {
-	BuildingBtree = false;
-
-	if (VacuumRunning)
-		vc_abort();
-
 	if (AMI_OVERRIDE)
 		return;