clang upload script: Make py3-compatible

In case `python` is py3, this keeps the script working.

Bug: 941669
Change-Id: I64f89dd226f8b019dd00fa6bb0c88747f567baa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2842345
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Arthur Eubanks <aeubanks@google.com>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Arthur Eubanks <aeubanks@google.com>
Cr-Commit-Position: refs/heads/master@{#874466}
GitOrigin-RevId: 211e5d7402ec3a865c39f3ae00caade2bfdf2a96
2 files changed