Ensure cs2cs emulation gets correct ellipsoid defn (#798)

Copy ellipsoid definition for proj=cart directly into the
proj_create call, rather than calling pj_inherit_ellipsoid_def
afterwards.

Previously, the ellipsoid definition was left out from the call.

pj_init_ctx would then pick up WGS84 from proj_def.dat, and the
init would succeed (and the possibly wrong ellipsoid definition
would later on be overwritten with the correct values by
pj_inherit_ellipsoid_def.

But if PROJ_LIB was not set or proj_def.dat was inaccessible for
other reasons, things went wrong.

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