clang/update.py: Build only the targets that we need.

See bug for details.

Bug: 919267
Change-Id: Ied50d4cea6d2302ab6e738c8ed50ba96f6d0d482
Reviewed-on: https://chromium-review.googlesource.com/c/1407652
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622294}
1 file changed