don't create assembly tarballs

marytts-assembly/assembly-runtime/src/main/descriptors/runtime-pkg.xml

@@ -3,8 +3,6 @@
   xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
   <id>runtime-pkg</id>
   <formats>
-    <format>tar.gz</format>
-    <!--format>tar.bz2</format-->
     <format>zip</format>
   </formats>