This fixes crash with BD-J menu, if libbluray isn't built with java
support.
(cherry picked from commit 3bc5c401996090ef409d0c76fd59c1d009b80c00)
(cherry picked from commit 96b0289176abe5a24eb1f854e74654b3c55d0574)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>