bazel: Presubmit for out-of-date build file.

Add presubmit check to identify any outdated Bazel build files which
are generated by Gazelle.

Bug: skia:13630
Change-Id: I0e3e63524efd12b4b5f4776be116294846d6db47
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/569116
Commit-Queue: Chris Mumford <cmumford@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed