#5015 libecl : Make sure *.UNSMRY is closed properly after data is read

Earlier attempts to fix this caused major performance issues. Now closing the file stream when reading of vector data is completed, seems to work as expected.

ThirdParty/Ert/lib/ecl/ecl_unsmry_loader.cpp

@@ -65,6 +65,10 @@ std::vector<double> unsmry_loader::get_vector(int pos) const {
     data[index] = *data_value;
   }
   int_vector_free( index_map );
+
+  if (ecl_file_view_flags_set(file_view, ECL_FILE_CLOSE_STREAM))
+      ecl_file_view_fclose_stream(file_view);
+
   return data;
 }