Fix crash with ChannelZipContainer before API 26 (#403)

Author: mickael-menu

readium/shared/src/main/java/org/readium/r2/shared/util/archive/channel/compress/utils/IOUtils.java

@@ -27,7 +27,6 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.ByteBuffer;
-import java.nio.file.LinkOption;
 
 /**
  * Utility functions
@@ -38,13 +37,6 @@ public final class IOUtils {
     private static final int COPY_BUF_SIZE = 8024;
     private static final int SKIP_BUF_SIZE = 4096;
 
-    /**
-     * Empty array of type {@link LinkOption}.
-     *
-     * @since 1.21
-     */
-    public static final LinkOption[] EMPTY_LINK_OPTIONS = {};
-
     // This buffer does not need to be synchronized because it is write only; the contents are ignored
     // Does not affect Immutability
     private static final byte[] SKIP_BUF = new byte[SKIP_BUF_SIZE];