ac_geo: Remove an unnecessary cast
ac_geo: Remove an unnecessary cast

No need to cast the string member in the array terminator in
ellipsoid ellipsoids[], such casts are really only required for variadic
functions.

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@digital-domain.net>

ac000/libac