Function ergo::ergo_lib_tx_builder_set_context_extension

#[no_mangle]
pub unsafe extern "C" fn ergo_lib_tx_builder_set_context_extension(
    tx_builder_mut: TxBuilderPtr,
    box_id_ptr: BoxIdPtr,
    ctx_ext_ptr: ContextExtensionPtr
)

Set context extension for a given input