update.py used to be used only on Windows until very recently, but
Windows and non-Windows have been at the same clang revision for
a while now. So even a few months ago update.py and update.sh
would've contained the same clang revision.
BUG=chromium:494442
Change-Id: Ie9127a1c49e31a7810ee431f8e662350c245917c
Reviewed-on: https://boringssl-review.googlesource.com/6620
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
7100ee9832