The get/set_taskdata functions are now part of the API of the class,
ensure they exist in the base class definition so the noop handler
works.
[YOCTO #7233]
(Bitbake rev: d571149cd82028c5e05cca33a3007ce1b779a654)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>