changed: disable rar support

multi-volume support in libarchive cannot use callbacks,
do not handle seeks graciously and various other show-stoppers.

since rar is often multi-volume disable the support. use vfs.rar.

vfs.libarchive/addon.xml.in

@@ -8,7 +8,7 @@
   <extension
     point="kodi.vfs"
     protocols="archive"
-    extensions=".7z|.tar.gz|.tar.bz2|.tar.xz|.zip|.rar|.tgz|.tbz2|.gz|.bz2|.xz"
+    extensions=".7z|.tar.gz|.tar.bz2|.tar.xz|.zip|.tgz|.tbz2|.gz|.bz2|.xz"
     files="true"
     directories="true"
     filedirectories="true"