solaris: implement the TASKQ_THREADS_CPU_PCT taskq flag

Now that we have a reliable number of CPUs indicator the implementation
is trivial.

bsd/sys/cddl/compat/opensolaris/kern/opensolaris_taskq.c

@@ -64,10 +64,8 @@ taskq_create(const char *name, int nthreads, pri_t pri, int minalloc __unused2,
 {
 	taskq_t *tq;
 
-	if ((flags & TASKQ_THREADS_CPU_PCT) != 0) {
-		kprintf("using unsupported TASKQ_THREADS_CPU_PCT flag\n");
-//		nthreads = MAX((mp_ncpus * nthreads) / 100, 1);
-	}
+	if ((flags & TASKQ_THREADS_CPU_PCT) != 0)
+		nthreads = MAX((mp_ncpus * nthreads) / 100, 1);
 
 	tq = kmem_alloc(sizeof(*tq), KM_SLEEP);
 	tq->tq_queue = taskqueue_create(name, M_WAITOK, taskqueue_thread_enqueue,