thermald: remove version suffix in libbrillo build rules The libbrillo library is installed without version suffix. BUG=chromium:920513 TEST=emerge Cq-Depend: chromium:1892317, chromium:1892377 Change-Id: I6838c56969254d44352e458c7e2d9d3a091a9203 Reviewed-on: https://chrome-internal-review.googlesource.com/c/chromeos/thermald/+/2069361 Tested-by: Grace Cham <hscham@google.com> Reviewed-by: Hidehiko Abe <hidehiko@chromium.org> Commit-Queue: Grace Cham <hscham@google.com>