Do not assume utils/create_unpackaged.pl is executable

git-svn-id: http://svn.osgeo.org/postgis/trunk@12675 b70326c6-7e19-0410-871a-916f4a2858ee
Fix undefined behavior in ptarray_calculate_gbox_geodetic (#2774)

Patch by Paul Ramsey

git-svn-id: http://svn.osgeo.org/postgis/trunk@12676 b70326c6-7e19-0410-871a-916f4a2858ee