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: 9b5b1bd7d77e3f5886f6c557d3b750de1f6d6025)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>