Temporary fix for IndianaJones and BattleForNaboo.

IndianaJones and BattleForNaboo use a different version of musyx ucode.
In this later version, some data structures have changed, which makes it incompatible with the
previous version (and cause the emulator to crash...).
This patch avoid the emulator crash by not handling the task.
Proper fix requires more reverse engineering effort.
Merge pull request #12 from bsmiles32/musyx_temporary_fix

Temporary fix for IndianaJones and BattleForNaboo.