Busybox-1.10.3: ENABLE_FEATURE_TASKSET_FANCY -> cpu_set_t undefined

[KokHow.Teh at infineon.com]

Hi;
	I turn on ENABLE_FEATURE_TASKSET_FANCY and cpu_set_t is
undefined. Linux kernel source has cpumask_t defined in
include/linux/cpumask.h. Please advise.

Regards,
KH