The player appearance sound was tied to the player appearance vclip,
but this is wrong because the vclip has a shorter lifetime than the
sound. This mistake was previously hidden by the hack that caused
non-permanent sounds to be routed off to a separate queue that lost the
association between object and sound. Commit 4a98e79 eliminated that
hack because it complicated the work of that commit. However, without
the hack, object sound effects cannot outlive their host object.
Fix this by binding the sound to the position of the appearance effect,
not to the appearance object. This works since the appearance effect
cannot move, so there was no value to binding the sound to the object.
This solution could not be used for objects that move and terminate
before their associated sound effect.
Reported-by: Ryusei117 <https://github.com/dxx-rebirth/dxx-rebirth/issues/88#issuecomment-390054173>
Fixes: 4a98e796ab ("Prevent stacking weapon rotation sounds")
5d74fd48b5