Function proj_sys::proj_prime_meridian_get_parameters

pub unsafe extern "C" fn proj_prime_meridian_get_parameters(
    ctx: *mut PJ_CONTEXT, 
    prime_meridian: *const PJ, 
    out_longitude: *mut f64, 
    out_unit_conv_factor: *mut f64, 
    out_unit_name: *mut *const c_char
) -> c_int