Remove long-dead support for invoking queries from dynamically loaded

backend functions via backend PQexec().  The SPI interface has long
been our only documented way to do this, and the backend pqexec/portal
code is unused and suffering bit-rot.  I'm putting it out of its misery.

Author: tglsfdc

src/backend/commands/async.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.65 2000/06/08 22:37:01 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.66 2000/07/08 03:04:12 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -87,6 +87,7 @@
 #include "libpq/libpq.h"
 #include "libpq/pqformat.h"
 #include "miscadmin.h"
+#include "tcop/dest.h"
 #include "utils/fmgroids.h"
 #include "utils/ps_status.h"
 #include "utils/syscache.h"

src/backend/libpq/Makefile

@@ -4,15 +4,17 @@
 #    Makefile for libpq subsystem (backend half of libpq interface)
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/backend/libpq/Makefile,v 1.20 2000/06/17 00:09:40 petere Exp $
+#    $Header: /cvsroot/pgsql/src/backend/libpq/Makefile,v 1.21 2000/07/08 03:04:39 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
 SRCDIR = ../..
 include ../../Makefile.global
 
-OBJS = be-dumpdata.o be-fsstubs.o be-pqexec.o portal.o portalbuf.o \
-	auth.o hba.o crypt.o password.o \
+# be-fsstubs is here for historical reasons, probably belongs elsewhere
+
+OBJS = be-fsstubs.o \
+	auth.o crypt.o hba.o password.o \
 	pqcomm.o pqformat.o pqpacket.o pqsignal.o util.o