prep for beta2 tagging

git-svn-id: http://svn.osgeo.org/postgis/trunk@11439 b70326c6-7e19-0410-871a-916f4a2858ee
switch download location to downloads.osgeo.org

git-svn-id: http://svn.osgeo.org/postgis/trunk@11440 b70326c6-7e19-0410-871a-916f4a2858ee