Output single upgrade script for postgis: postgis_upgrade.sql

git-svn-id: http://svn.osgeo.org/postgis/trunk@12274 b70326c6-7e19-0410-871a-916f4a2858ee
Update ignore file now that we have a single postgis_upgrade.sql

git-svn-id: http://svn.osgeo.org/postgis/trunk@12275 b70326c6-7e19-0410-871a-916f4a2858ee