Fix pg_upgrade test script's line end handling on Windows.

Call pg_dumpall using -f switch instead of redirection, to avoid
writing the output in text mode and generating spurious carriage
returns. Remove to carriage return ignoring hack introduced by
commit e442b0f0.

Backpatch to 9.2.

contrib/pg_upgrade/test.sh

@@ -67,7 +67,7 @@ set -x
 $oldbindir/initdb
 $oldbindir/pg_ctl start -l "$logdir/postmaster1.log" -w
 if "$MAKE" -C "$oldsrc" installcheck; then
-	pg_dumpall >"$temp_root"/dump1.sql || pg_dumpall1_status=$?
+	pg_dumpall -f "$temp_root"/dump1.sql || pg_dumpall1_status=$?
 	if [ "$newsrc" != "$oldsrc" ]; then
 		oldpgversion=`psql -A -t -d regression -c "SHOW server_version_num"`
 		fix_sql=""
@@ -115,7 +115,7 @@ if [ $testhost = Msys ] ; then
 else
 	sh ./analyze_new_cluster.sh
 fi
-pg_dumpall >"$temp_root"/dump2.sql || pg_dumpall2_status=$?
+pg_dumpall -f "$temp_root"/dump2.sql || pg_dumpall2_status=$?
 pg_ctl -m fast stop
 if [ -n "$pg_dumpall2_status" ]; then
 	echo "pg_dumpall of post-upgrade database cluster failed"
@@ -128,10 +128,6 @@ else
 	sh ./delete_old_cluster.sh
 fi
 
-if [ $testhost = Msys ] ; then
-       dos2unix "$temp_root"/dump1.sql "$temp_root"/dump2.sql
-fi
-
 if diff -q "$temp_root"/dump1.sql "$temp_root"/dump2.sql; then
 	echo PASSED
 	exit 0