Remove obsolete and unportable enable_plpgsql script. createlang has

been the supported and documented way to do this for a long time...

src/pl/plpgsql/enable_plpgsql

-#!/bin/sh
-
-# Enable the PL procedural language for PostgreSQL in one or more
-# existing databases. 
-#
-# This script should be run by the PostgreSQL superuser
-
-enable_database() {
-	if ! psql -d $1 -qtc "select count(*) from pg_language where lanname='plpgsql'" >$TMPFIL2 2>&1
-	then
-		echo "Cannot connect to $1"
-		exit 2
-	fi
-	if [ `cat $TMPFIL2` -eq 0 ]
-	then
-		if ! psql -d $1 <$sqlfile
-		then
-			echo "Failed to add PL to $1"
-			exit 2
-		fi
-		echo "PL added to $1"
-	else
-		echo "PL is already enabled in $1"
-	fi
-
-}
-
-# Execution starts here
-
-TMPFILE=`mktemp /tmp/enable_pgpl.XXXXXX`
-TMPFIL2=`mktemp /tmp/enable_pgpl.XXXXXX`
-trap "rm $TMPFILE $TMPFIL2" EXIT
-
-sqlfile=${PGLIB:=/usr/local/pgsql/lib}/mklang_pl.sql
-if [ ! -f $sqlfile ]
-then
-	echo "Cannot find mklang_pl.sql"
-	exit 2
-fi
-
-if [ -z "$1" ]
-then
-	echo "Syntax: $0 --all | database ..."
-	exit 1
-fi
-
-if [ $1 = "--all" ]
-then
-	if ! psql -t -c "select datname from pg_database order by datname" >$TMPFILE
-	then
-		echo Cannot select databases
-		exit 2
-	fi
-	for db in `cat $TMPFILE`
-	do
-		enable_database $db
-	done
-else
-	while [ -n "$1" ]
-	do
-		db=$1
-		enable_database $db
-		shift
-	done
-fi
-
-
-