Hack around misuse of reserved names `clock' and and `time' in a different way.  Defining KERNEL before including <sys/time.h> broke when "opt_cpu.h" was included in a deeply nested header, except in -current where the problem is masked by a namespace pollution bug in <stdio.h>.
Hack around misuse of reserved names `clock' and and `time' in a different
way.  Defining KERNEL before including <sys/time.h> broke when "opt_cpu.h"
was included in a deeply nested header, except in -current where the
problem is masked by a namespace pollution bug in <stdio.h>.

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