Testing: Fix test for AppVeyor

tests/grib_to_netcdf.sh

@@ -53,8 +53,9 @@ if test "x$NC_DUMPER" != "x"; then
     grep -q "short tp_0001" $tempText
 fi
 
+if [ $ECCODES_ON_WINDOWS -eq 0 ]; then
     echo "Test HDF5 decoding ..."
-# -------------------------
+    # ---------------------------
     # Note: this is only available in NetCDF-4. So need to check if the command worked with -k3
     input=${data_dir}/sample.grib2
     set +e
@@ -66,7 +67,7 @@ if [ $stat -eq 0 ]; then
         res=`${tools_dir}/grib_get -TA -p identifier,versionNumberOfSuperblock $tempNetcdf`
         [ "$res" = "HDF5 0" ]
     fi
-
+fi
 
 grib_files="\
  regular_latlon_surface.grib2 \