libgeotiff: turn off format hardening

pkgs/development/libraries/libgeotiff/default.nix

@@ -10,6 +10,8 @@ stdenv.mkDerivation {
 
   buildInputs = [ libtiff ];
 
+  hardening_format = false;
+
   meta = {
     description = "Library implementing attempt to create a tiff based interchange format for georeferenced raster imagery";
     homepage = http://www.remotesensing.org/geotiff/geotiff.html;