Clang package.py: Don't run 'git diff' before building

If there is a diff, build.py will nuke the repository anyway. And in
pathological circumstances (see bug), printing the diff can take a very
long time.

Bug: 1014241
Change-Id: Ic045dfef66c7695b07ba9099352744d5becdcdfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862916
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#705937}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a6bb1c557ba5e0ac819ce7a16d77b930a0c986f9
1 file changed