Remove unneeded step for Hadoop 3.3 and later (#250)

Prevent unnecessary javax.activation-api step for Hadoop 3.3 and later,
where it is already included in the Hadoop binary.
diff --git a/bin/impl/install/hadoop.sh b/bin/impl/install/hadoop.sh
index 6dd04c0..a0a4f9d 100755
--- a/bin/impl/install/hadoop.sh
+++ b/bin/impl/install/hadoop.sh
@@ -41,7 +41,10 @@
   cp "$UNO_HOME"/conf/hadoop/2/* "$hadoop_conf/"
 else
   cp "$UNO_HOME"/conf/hadoop/3/* "$hadoop_conf/"
-  # need the following for Java 11, because Hadoop doesn't include it
+fi
+
+if [[ $HADOOP_VERSION =~ ^3\.[012]\..*$ ]]; then
+  # need the following for Java 11, because Hadoop doesn't include it until 3.3
   # Using maven-dependency-plugin version 3.1.1 explicitly, because some older
   # versions require to be executed within a POM project
   mvn org.apache.maven.plugins:maven-dependency-plugin:3.1.1:copy \