I seem to be missing references named in erl_driver.h

I added some extra link flags to verify all required functionality is
available during linking, so I noticed all the functionality mentioned in
erl_driver.h seems to be missing:
- erl_drv_thread_self
- set_port_control_flags
- driver_alloc
- driver_free
- driver_failure_atom
- driver_system_info
- driver_output