Adjust some links in Javadoc from "http:" with "https:"

Also remove linking JavaDoc to itself, the link was wrong anyway and will not work
during generating JavaDoc usually

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1869929 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/build.xml b/build.xml
index 0dfa1e7..3c8184d 100644
--- a/build.xml
+++ b/build.xml
@@ -439,11 +439,10 @@
             <excludepackage name="repackage.*"/>
             <excludepackage name="org.apache.xmlbeans.impl.xb.*"/>
             <excludepackage name="org.apache.xmlbeans.impl.jam.*"/>
-            <link href="http://xmlbeans.apache.org/${version.base}/docs/reference/index.html"/>
-            <link href="http://docs.oracle.com/javase/8/docs/api/"/>
-            <link href="http://docs.oracle.com/javaee/7/api/"/>
-            <link href="http://xml.apache.org/xerces-j/apiDocs/"/>
-            <link href="http://ant.apache.org/manual-1.9.x/api/"/>
+            <link href="https://docs.oracle.com/javase/8/docs/api/"/>
+            <link href="https://docs.oracle.com/javaee/7/api/"/>
+            <link href="https://xml.apache.org/xerces-j/apiDocs/"/>
+            <link href="https://ant.apache.org/manual-1.9.x/api/"/>
         </javadoc>
     </target>