Fix compatibility test.

Signed-off-by: Franz Wilhelmstötter <franz.wilhelmstoetter@gmail.com>

Author: jenetics

jpx/src/test/java/io/jenetics/jpx/GPXTest.java

@@ -38,9 +38,7 @@
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.OutputStream;
-import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.nio.file.StandardOpenOption;
 import java.text.NumberFormat;
 import java.util.Collections;
 import java.util.List;