buildtools: update libunwindstack version for standalone builds
buildtools: update libunwindstack version for standalone builds

Profilers reference a new error code that needs updated libunwindstack
headers.

Change-Id: I317ec5ccfc3168eb341235ae32ce50388964744c
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto