remove unused Solr optional extra handler lib solr-dataimporthandler-6.6.0.jar

.classpath

@@ -86,7 +86,6 @@
 	<classpathentry kind="lib" path="lib/solr-solrj-6.6.0.jar"/>
 	<classpathentry kind="lib" path="lib/zookeeper-3.4.10.jar"/>
 	<classpathentry kind="lib" path="lib/metrics-core-3.2.2.jar"/>
-	<classpathentry kind="lib" path="lib/solr-dataimporthandler-6.6.0.jar"/>
 	<classpathentry kind="lib" path="lib/spatial4j-0.6.jar"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
 	<classpathentry kind="lib" path="lib/icu4j-58_2.jar"/>

build.xml

@@ -252,7 +252,6 @@
         <pathelement location="${lib}/slf4j-api-1.7.24.jar" />
         <pathelement location="${lib}/slf4j-jdk14-1.7.24.jar" />
         <pathelement location="${lib}/solr-core-6.6.0.jar" />
-        <pathelement location="${lib}/solr-dataimporthandler-6.6.0.jar" />
         <pathelement location="${lib}/solr-solrj-6.6.0.jar" />
     	<pathelement location="${lib}/spatial4j-0.6.jar" />
         <pathelement location="${lib}/stax2-api_3.1.4.jar" />