eina: fix eina vector in case output vector the same as target vector

eina: fix eina vector in case output vector the same as target vector

Summary:
Use aditional temporary vector for intermedia results in case output vector
the same as target vector in functions:
eina_vector2_transform,
eina_vector2_homogeneous_direction_transform,
eina_vector3_cross_product,
eina_vector3_transform,
eina_vector3_homogeneous_direction_transform
It was in original version (in evas_vecN, module evas_3d_utils.h)
Enrich test suit for this case.

Reviewers: jpeg, cedric

Reviewed By: cedric

Differential Revision: https://phab.enlightenment.org/D3795

Signed-off-by: Cedric Bail <cedric@osg.samsung.com>