[Backport 9.3] Ellipsoid::_isEquivalentTo(): fix so that an ellipsoid of semi-major … #3882
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…axis A (and non-zero inv flattening) isn't equivalent to a sphere of radius A... or to another ellipsoid of same semi-major axis but defined from a semi-minor axis and not inverse flattening Discovered when debugging corner cases of #3879 ...
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Backport #3880
Authored by: @rouault