SPDX: license tags: CDDL-1.0

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>

lib/libtpool/thread_pool.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: CDDL-1.0
 /*
  * CDDL HEADER START
  *

lib/libtpool/thread_pool_impl.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: CDDL-1.0
 /*
  * CDDL HEADER START
  *