Fix archived assemblies (tar.gz and zip) to have fixed modes.

+ Not taking the modes from whatever defaults the filesystem
  that ran the build is currently on.

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

jetty-home/src/main/assembly/jetty-assembly.xml

@@ -15,6 +15,8 @@
         <exclude>**/META-INF/**</exclude>
         <exclude>*-config.jar</exclude>
       </excludes>
+      <fileMode>0444</fileMode>
+      <directoryMode>0755</directoryMode>
     </fileSet>
   </fileSets>
 </assembly>