[LSC] Add LOCAL_LICENSE_KINDS to external/pthreadpool am: 3424fb16ee am: ae5409bee6

Original change: https://android-review.googlesource.com/c/platform/external/pthreadpool/+/1589013

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I16365946f9c2a1b4d6608638914fdc7e403840d7