MFC 270222: Bump the default size of cpuset_t masks in userland from 128 bits to 256.
MFC 270222:
Bump the default size of cpuset_t masks in userland from 128 bits to 256.

This should not be an ABI change since the various public APIs that use
cpusets all include an explicit size parameter in addition to the cpuset
parameter.

Approved by:	re (gjb)

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