Remove unused variable. Ticket #2884.

git-svn-id: http://svn.osgeo.org/postgis/trunk@12879 b70326c6-7e19-0410-871a-916f4a2858ee
cast const char * to char *. Ticket #2885

git-svn-id: http://svn.osgeo.org/postgis/trunk@12880 b70326c6-7e19-0410-871a-916f4a2858ee