message: make Dataset Send only for versions >= 2.3
diff: @@ -30,6 +30,9 @@ pub fn _register_drivers() {
  // GDAL Docs state: The returned dataset should only be accessed by one thread at a time.
  // See: https://gdal.org/api/raster_c_api.html#_CPPv48GDALOpenPKc10GDALAccess
  +// Additionally, VRT Datasets are not safe before GDAL 2.3.
  +// See: https://gdal.org/drivers/raster/vrt.html#multi-threading-issues
  +#[cfg(any(all(major_is_2, minor_ge_3), major_ge_3))]
  unsafe impl Send for Dataset {}
  impl Dataset {
  