tests: t-mpi-point: Remove implementation dependent checks.
* tests/t-mpi-point.c (basic_ec_math): Remove comparing X and Y, only comparison of Z is relevant, mathematically. Remove useless check, where different values in equivalence class exist. (basic_ec_math_simplified): Likewise.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>