[AD] div-by-zero... get_vector_rotation_quat()

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from  /allegro419/src/quat.c

has ASSERT(l != 0);
and a /* C comment */ in the file about possible problems when passing data=0.0

doesn't ASSERT only work during the debug runtime ?
what happens in a release build at runtime ?

if no code changes come of this, can the documentation say something about passing 0.0 and the potential for crash.

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